Overall gain as opposed to factory manifold is bugger all , its the midrange gain that makes it worth it . 2 inch is too big , 1 3/4 is the biggest I would go . Work out volumetric efficiency of each cylinder and you will see why
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Email Notifications Failing (mostly Telstra)
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Welcome to the new look VWWatercooled
After much work and little sleep there is a new version of the forums running on more powerful and recent hardware as well as an upgraded software platform.
Things are mostly the same, but some things are a little different. We will be learning together, so please post questions (and answers if you've worked things out) in the help thread.
Things are mostly the same, but some things are a little different. We will be learning together, so please post questions (and answers if you've worked things out) in the help thread.

The new forum software is an upgraded version of what came before, it's mostly the same but also a little different. Hopefully easier to use and more stable than before.
We are learning together here, so please be patient. If you have questions, please post them here. If you have worked something out and can provide an answer,
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I'm with you Loon
When I brought & fitted a set of hurricane 4-2-1 extractors along with a full 2" system with a single hotdog(resonator) and 2.5" straight through muffler along time ago & tuned it, I couldn't believe the difference it made.
You didn't need a dyno graph to tell you it was making more power, could feel it all the way through the power range. It was sharp & very responsive (especially when I had 3" straight through rear muffler but after 1.5 years of driving to Melb and getting older & wiser, the noise got too much.)
I've since changed back to a rear 2" muffler, and doing that the engine isn't as sharp or responsive as it used to be but is a hell of alot better on the ears.
I brought these in 1996 from a local exhaust place.
I just rang Exhaust Bros (03) 5277 9719 and the still have a listing for Hurricanes 4-2-1 & can still get them.
They quoted $330 fitted or $280 supplied.
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Are we talking about individual header size or exhaust size ?
The other thing to note is there is no point changing exhaust on stock engine , the gains are minimal , its only once compression is raised , cams and valves are fitted that you should look into changing exhaustBug_racer supports the rebellion of the euro revolution
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Originally posted by Bug_racerAre we talking about individual header size or exhaust size ?
The other thing to note is there is no point changing exhaust on stock engine , the gains are minimal , its only once compression is raised , cams and valves are fitted that you should look into changing exhaust
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2025 - Below Forum
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