Mk3 Exhaust Thread!!!

[Golfer]

dont go x force there **** as

True? Have you had a bad experience with them? I was looking at them because they are a half stainless/half glass pack, so i'd only have to run one muffler (it's still be loud though). Should I perhaps go for a full stainless pack with a hotdog where the suitcase was?

[tommymac]

i got one on my car now and i cant wait to take it of its to loud and sounds like aids im trying to musta up funds to swap mine at but its so expensive here t get a good system cat back miltek was 1500 from mem

[DubSteve]

I 've done something like that. Genie headers plus Remus the rest of the way. It wasn't cheap. Nearly 2G if I remember. But that was 1998 and its all still there.

Be aware that the original VR downpipe is heat shielded. Extractors aren't. Heat rises. Over the top of the extractors are lots of very expensive rubber pipes. These include the vacume hose to the brake power booster. A few centimeters behind are the brake lines. Just off side is the ABS. It all goes very funny if you haven't devised some clever heat shielding too.

When its working its lovely to listen to and the lift in performance is immediately noticeable.

I was planning on puting a heat shield there or some kind of heat wrap. Would that work?

[Bug_racer]

Seriously if you have a factory 2 inch stainless exhaust system with some mandrel bends and you replace it with a 2 1/4 inch with press bends and mild steel and expect a performance you seriously need to do some research .

Best system for a mk3 is a set of merged headers , stock cat , 2 1/4 mandrel bent with stainless steel hot dog then a nice big rear muffler . I'd do 2 1/2 inch for VR6 . BUT , Id only do the exhaust after I do chip , cams , airbox and manifold portwork . The other thing to note is that some VW's have stock extractors . Remember if you want power , there is rarely a cheap way of doing it thats reliable as well

[brackie]

In terms of gas flow (and by that I mean the mixture of induction gases and the mixture of exhaust gases) is a conservation matter. Nothing is created or destroyed only transformed, so you must get the stuff out as efficiently as you get it in. There are matters of relative temperatures and volumes to consider: in other words the engine breathes in a relatively smaller volume of lower temperature gasses than it exhausts (albeit at a higher induction density), so getting the stuff out is just as important as getting it in. Perhaps more important.
Smooth, unhindered pathways are very important so small angle bends, large diameters plumbing and smooth passage surfaces all help flow.
Before doing any work on induction, I would ensure that exhaust flow is up to it.
Disclaimer. This is from a diesel guy who knows sfa about tuning petrol motors so please correct me if I'm wrong.

[Bug_racer]

Sounds about right , the welding sometimes is just as important as the pipework and bends used . Tig is often better than mig .
Just the size is important in backpressure and extractor effect .

VR6's are a nightmare with all different runners

[Water Boy]

I would go a full 2inch system with a strait through muffler and a single 2.5 dump tip... Dont go to ricer... Extractors would be very nice and give an awsome tourqey sound...

Thats my 2 bobs worth...

Cheers James

[Golfer]

Thanks Seb and Brackie.

Invaluable information there.

I have a place around here that used to do my exhaust, and they made a great dual mandrel system for my xr8, so i'm sure i can let them go nuts on the dub.

I personally don't know a lot about small engine dynamics, but having driven a ford motorsport tuned V8 around for years, i understand how much difference it makes getting rid of your waste gas efficiently...

Thanks again guys. Having a rethink now and I'll post what i come up with

Cheers!
John

[golfvr6]

Any sugestions from any 2Litre-ers?

Sounds like a winner from me . . . But then i'm not really sure . . . I'm thinking off making mine a 2.5in zorst? will seee . . . .

my vr6 is a 2.5 inch mild steel, cat back with rear muffler only and single outlet. above 2500 revs, its not too loud.

my readings of the extractors on a vr6 (in 97) were that you didn't get much gain for the price. so that swayed me to stick with the stock ones.

[Draco]

Does anyone know any specs on the limits of the dB output of an exhaust system?