Fitting an R32 exhaust on a Bora WITH Oettinger rear bumper - yes, I have searched!

[RubAVeeDubDub]

Hi all,

I know there has been discussion on fitting a R32 exhaust on the Bora 4mo, but I have not found any information that suits my situation.

I have a Bora 4mo Sport with the Oettinger bodykit. The rear bumper is a little different to the standard bora 4mo bumper. I've currently got a twin straight through system with twin tips installed on some custom piping from a muffler under the back seat (factory under-boot muffler deleted).

My current exhaust is far too drony from 2000-3000rpm (has an amazing gurgle though) and I've been given a R32 exhaust with piping all the way to the cat as a replacement from the previous owner.

My understanding is that the actual muffler and piping will tuck under the bora 4mo boot & diff, and mount up to the factory exhaust mounts, but the difficulty is regarding the tips amd getting the single pipe R32 exhaust to match up the twin cat system Bora?

Has anyone successfully fitted a R32 onto a oettinger bodykitted bora? Is there enough gap between the bumper and the R32 muffler for the shop to fit any tips on the end of the R32 muffler and tuck under the bumper ? I really don't want to remove or cut the body kit.

Also, sound-wise, it seems the R32 exhaust is more high pitched like a motorbike/F1 car. Amirite?

If I wanted to retain a low gurgly noise that was legal (i.e. no more than 90db's at 2800rpm from 1m at a 45deg angle) is there any options?

Appreciate any and every help!

P.S. I'll try and get a flyby with my current zhorst if anyone wants to hear it. Sounds absolutely horn - everyone I've shown loves it. Shame victoria has such draconian modification laws.

[grtuned]

I've fitted the r32 exhaust to my Bora. It fits but there a few things that need to be considered but I found out my self. Firstly the bora is longer than the golf due to the boot so you will need to extend the exhaust from the join at the intermediate pipe. I did this by cutting my original exhaust and then buying another adapter to join them. Second you need to also buy a another exhaust hanger for the right side. Your tail pipes will still sit under the bar and will also need to be extended. At the moment I've got them pointing down a little as I've been looking for a rear valance that can accommodate the twin pipe setup but no luck and time is an issue I've fitted a 2.0 valance at the moment which has no cut outs and I might have that adapted to suit the twin pipes. As for your question regarding the ottinger rear bar post a pic id like to see what it looks like. Also with sound I had it running without the flap but it got annoying at low revs so I've connected the vacuum lines and have it working as original sounds awesome over 3,500 rpm. Cheers.

[RubAVeeDubDub]

Never got to say thanks grtuned for your post mate!! Shame on me!

You were right on the money with the fitting. Had the R32 zhorst fitted last week.

As you said, the single pipe was joined into the twin cats with a thick Y piece, and he has chopped up and rewelding the right hangar to make it mount up. The catback R32 zhorst tucked under the diff and the boot area very nicely. Looks pretty factory.
I also had no issues with the R32 tips. I've got the Oettinger rear bumper and the installer just extended the pipes from the muffler to the tips and they tucked very nicely under the oettinger valance. If you can find a oettinger rear lip, then your config should work great.

With regards to the flapper, if it's not connected to a vacuum line, then is it permanently open?

Loving the noise of this exhaust. It's not growly or throaty but really refined and more like a 600cc motorbike.

Best part has to be change in the power curve and what appears to be a free up of some power. It's so much more punchy and volatile in the low to mid range. Far too much fun! I think my previous exhaust setup may have been restrictive - even though it only involved a small VE crummybore muffler and some small hotdog resonators.

[BL33SU]

I've fitted the r32 exhaust to my Bora. It fits but there a few things that need to be considered but I found out my self. Firstly the bora is longer than the golf due to the boot so you will need to extend the exhaust from the join at the intermediate pipe. I did this by cutting my original exhaust and then buying another adapter to join them. Second you need to also buy a another exhaust hanger for the right side. Your tail pipes will still sit under the bar and will also need to be extended. At the moment I've got them pointing down a little as I've been looking for a rear valance that can accommodate the twin pipe setup but no luck and time is an issue I've fitted a 2.0 valance at the moment which has no cut outs and I might have that adapted to suit the twin pipes. As for your question regarding the ottinger rear bar post a pic id like to see what it looks like. Also with sound I had it running without the flap but it got annoying at low revs so I've connected the vacuum lines and have it working as original sounds awesome over 3,500 rpm. Cheers.

any chance of a quick 'how to' make the flapper work like the standard r32 setup?

any some vid's would be great guys
keen to change my exhaust setup too...

[beale187]

Love that look Rub with quad pipes, any pic's of the new setup with the R32 zhorst? Also I'm assuming that R32 zhorst from a MkIV R32?

Whilst I've got you, have you owned that 4mo for long? Could have swore that looks like the one I was going to buy couple of months back, I think the previous owner was located in ACT??

[grtuned]

The flapper is controlled by vacuum and a solenoid which is located on the left hand rear on the golf R32. Its speed dependent at 60kph the ecu signal closes the vacuum to the flapper as it's spring loaded it opens up. The bora ecu can't do it the only way around it is to connect it to the variable intake manifold system which has its own solenoid under the intake piping. Just use a Y connector attach vacuum hose to it then run it down to the flapper. It works fine for me at around 4,000 Rpm exhaust opens up and sounds nice when just cruising. I have purchased the original solenoid from a golf but haven't had time to try set it up.

[RubAVeeDubDub]

Love that look Rub with quad pipes, any pic's of the new setup with the R32 zhorst? Also I'm assuming that R32 zhorst from a MkIV R32?

Whilst I've got you, have you owned that 4mo for long? Could have swore that looks like the one I was going to buy couple of months back, I think the previous owner was located in ACT??

Haha thanks. Yeah the quad tips look really aggressive.
I can't get much photo's before the sun drops at like 530pm so there might be a bit of a wait until I get a chance on a weekend.

Yep, right on the money with the exhaust being from a R32 MKIV golf.

Did the one you look at have a beige interior, oettinger bodykit and sunroof? If so, then it's likely this one. I did buy it in ACT from a someone called "Seb" who I hear is relatively well known around these paths.
Bought it back in Oct last year and been fixing up the many issues it has had since.

The flapper is controlled by vacuum and a solenoid which is located on the left hand rear on the golf R32. Its speed dependent at 60kph the ecu signal closes the vacuum to the flapper as it's spring loaded it opens up. The bora ecu can't do it the only way around it is to connect it to the variable intake manifold system which has its own solenoid under the intake piping. Just use a Y connector attach vacuum hose to it then run it down to the flapper. It works fine for me at around 4,000 Rpm exhaust opens up and sounds nice when just cruising. I have purchased the original solenoid from a golf but haven't had time to try set it up.

Sounds awesome grtuned!! Do you have any pics of your setup - specifically around the intake manifold area where you connected the flapper valve vacuum line?

Do you think the way you've plumbed the flapper in makes the exhaust sound legal?
I've been looking into running a custom made system to electronically control the flapper function. I could wire in a solenoid into your setup and then at least have the control to keep it closed and quiet at low revs.

[grtuned]

Ill post up some pics this weekend. It works fine and never had an issue with it legally. But to be honest I don't think the r32 exhaust is illegal as it's fitted to a factory standard car.

[beale187]

Yup Seb, that's the man.. But I swore I would never buy another black car, if that wasn't the case your car would have been my new car!

BTW loving this thread guys, I'll be watching it very closely as I have plans on doing exactly the same thing.

[RubAVeeDubDub]

Ill post up some pics this weekend. It works fine and never had an issue with it legally. But to be honest I don't think the r32 exhaust is illegal as it's fitted to a factory standard car.

If you could, that'd be amazing. Would so good to have some way to quieten the exhaust.

I've never heard anyone testing the R32 MKIV exhaust but it would've been made to ADR standards which can be different from the state/EPA based rules.

Yup Seb, that's the man.. But I swore I would never buy another black car, if that wasn't the case your car would have been my new car!

BTW loving this thread guys, I'll be watching it very closely as I have plans on doing exactly the same thing.

I remember Seb saying that someone else was interested in the car. Must've been you!
Judging by the pictures of your ride, the 4mo you have is in supremely better condition than my one. I have a lot of work to do on the interior, exterior and some mechanical work to bring my 4mo up to a nice standard. 12 years of usage really shows.

[grtuned]

Here's a pic where it's connected using T piece. It will keep exhaust tone down while driving normally.

[RubAVeeDubDub]

Thanks so much for posting that grtuned!! You are legend!

I'm going to hopefully follow suit this weekend and quieten the exhaust down for the time being.

Just to confirm, where the vacuum line you plumbed into start and finish?

I'm looking at fitting an electronically controlled air flow solenoid that could allow the vacuum line to the exhaust flapper to be controlled - i.e. open vacuum line to flapper to restrict noise under 4000rpm or turn off the vacuum and have the flapper fully open for full noise.
Solenoid hunt has been a bit fruitless so now looking at some 2nd hand options from anouther car. I'll scourer out a local pick-a-part wrecker soon and report back if I find anything useful.

[BL33SU]

how did u run the vacuum line all the way back to the rear? under the car or inside the cabin to the boot?

[grtuned]

Fitting an R32 exhaust on a Bora WITH Oettinger rear bumper - yes, I have sea...

Yeah that's right connect T piece into existing vacuum line you cant get it wrong then run line to flapper. I used flexible hose at both ends and used hard type plastic vacuum hose to connect the two together. You can see white hose in pic!!

[beale187]

Mine is a one owner job. Picked it up from a I.T. guru in ACT, it's in great nick but took me like 6mths to find. If you're having trouble finding parts for these or just need too many parts you might want to consider checking the damaged vehicle auctions. These things normally sell for around $1,000. Take what you need and sell off the rest much cheaper than buying everything individually from a wrecker or eBay.