2.25 or 2.5 on a VR6?

[ozbmx]

hey fells, yep im a noob to the VR6 thing.

so i have decided that i will be upgrading the exhaust system on the VR6...

some people say 2.5 others say 2.25 diameter...

whats optimum and why?

[Damo88]

2.5 tried, tested and dyno'd showing better performance. There's a thread on vortex which someone posted up here not that long ago that covers all vr6 mods

[MattyT]

I've had a variety of exhausts on mien dub so maybe I can help.

When I got the car it had a 2.5" straight-through system. VERY loud, sounded awesome at full revs gave great power but lousy low end torque for tootling around.

Then ditched the straight through muffler for a "sports" one. Much quieter, a little bit more torque but still great top end go.

Then ditched that for a 2.25" mangaflow system imported from the US. Lost a lot of top end but gained a noticeable increase in torque for around town which has been very welcome. Unfortunately though the magnaflow has a pretty bad resonance issue so it'll be departing at some point.

[cheesus]

I'd go 2.25"...2.5" will be drony as.

[jayjay]

Have a read of this.

Eurotuner VR6 Exhaust Comparison

[Tim]

Only poor exhausts drone. I have a 2.5" Jetex exhaust on my VR6 and its not that loud at all. Made more power up top and down low over the standard 2.125" system

[The_Hawk]

My exhaust is 2.5" and has a bit of a drone at 80, something I think I would change if I was driving any real distance. I also built mine with the intent of forced induction so 2.5" was the better choice.

I do have two resonators and a muffler but don't know if there would be a way to better "tune" the whole shebang to make it quieter… But then I do like the noise too

[ozbmx]

noise is not a drama for me... i reckon ill give the 2.5 straight through a go. i will let you know the results...

[terps]

plz ozbmx i need feed back on that