2.75" V's 3" - what do you think?..

[Rusty]

Sounds ideal for a regularly used road/track weapon Andy

so is yours a twin box or single box system then? Did they ever make a jig for a proper 3" downpipe mate?

Yeah, it's spot on TBH, when I strip the old girl out it'll sound great, with the interior in it's nice and sensible.

Yeah, got a 3" DP and a single box with sports cat. If I had to use the car every day then I have a bolt-in centre section with a silencer, takes it down to OE sound levels unless you're on WOT.

The DP is 2.5" to the WG pipe and then 3" after, if you specified it differently or with V bands then you could have it made differently I'm sure.

[europeanme]

My 3" is a 3" dp, sports cat and then 3" to the centre join (there's no box) then it's 2.5" to the custom rear box. Noise levels are low, a touch more than the Milltek ubt really not much. I would hope that this setup is suitable for about 400bhp, maybe more. It's a lot quieter than I thought and the fit and finish are very good.

Hey Andy....
Any chance of a sound clip??....and how's that new bike going?....

Mike

[europeanme]

a real dilemma here...some for 2.75 and some for 3"...oh what to do....

keep the tips coming....cheers n

[Jamo]

As long as the downpipe is 3" you can have the rest 2.75"

Trust me you do not want to fork out for 2 downpipes down the line, i'm paying for the previous owner deciding to go 2.75" downpipe instead of 3" from the off.

[MarT2]

I have the same problem! I have a complete RS2 setup, with wagner reverse intake and exhaust manifolds, and wagner intercooler. I don't know if mount a 2'75" supersprint or a 3" hand made exhaust...

I don't think that I will do more improvements...

What's the best option?

Cheers

[GazzaG60]

mine is a ojz(quattronics supplied) system, a work of art. still booms though. i9t does sound awesoem with the header though.

i have only 1 box in there.

under 350 doesn't need a 3" as stated, 2.5 even will do. however "free" hp is unveiled from a bigger system.

another trade-off of a turbo car.

[Ross]

mine is a ojz(quattronics supplied) system

<sensored - slip of the tongue>

3" is boomy, never did hear one that isn't. It can be quite deafening on a long journey, I think it's down to individual taste though. Some found riding in the back of my Coupe unbearable, others thought is was awesome.

On the other had a Milltek 2.75" system with cats, to me is quite refined. Only loud when you nail it. But there's definitely a performance increase with 3" systems. As said - it is a bit of a compromise, you may give up 10-15hp but the car will be much easier to live with on a long journey, and you probably won't set off many car alarms.

[GazzaG60]

i love settin off car alarms. the audi loses to the corrado on that one. supercharger whine is great for alarms.

its boomy and you can feel the resonance create a vibration through the car. women love that bit.

once over 2krpm it goes quiter as the turbo starts to subdue the noise more.

[Rusty]

MIne is nice and quiet and got me a larger bore where the gas speed is high. Works well.

[gedu]

I can't really say that my 3" exhaust was boomy. Infact all boom there was (when having a slight hangover) disappeared when I put original airbox back in (of all things :S). Also, boom can be induced by having outlet too short in relation to body, been there and seen that also. Yes, it's much nicer looking when nicely tucked with bumper cover, but reality is, 1-2" longer outlet and presto, welcome silence.

Yes, I know small chassis (S2/RS2) does have some issues with full 3" fitment that UrS4 doesn't have

[Jamo]

Yes, I know small chassis (S2/RS2) does have some issues with full 3" fitment that UrS4 doesn't have

No only the S2 Coupe as the pipe has to go over the axle

The RS2 and Avant do not have this problem as it does not go over the axle

[Error404]

MIne is nice and quiet and got me a larger bore where the gas speed is high. Works well.

Really want to hear yours mate as it sounds like the best of both worlds and not a PITA to fit over the diff etc at the back.

I'll need a system from turbo to rear axle (planning on using my current 2.5" back box) when i do my engine swap, may as well go 3" if i'm getting it fabbed up anyway.

for me 2.75" doesn't make sense unless its an off the shelf system, its not much of an issue to go 3" and far better performance benefits IMHO

[madpugger]

My Super Sprint full system (inc de-cat) nearly came off 10 mins after fitting. If it hadn't been such a PITA to fit it would have been. The boom was unbearable. However, now it is all coked up it sounds great. It is not boomy apart from in confined spaces, its fine on a long drive and apparently sounds great when you drive off into the distance With the car stock I noticed a lot better pick-up (despite having a blooming misfire every now and again)

I am a little worried now reading this thread though, in that I want to go the 3071R route... Hopefully the de-catting should counter the effects of smaller bore.

I seem to remember MRC saying this was a really good exhaust to tune with on a thread here before I bought it which was partly why i want for it. Fitment is excellent as is the one on the S3, and I got 30% trade discount

[add]

My Super Sprint full system (inc de-cat) nearly came off 10 mins after fitting. If it hadn't been such a PITA to fit it would have been. The boom was unbearable. However, now it is all coked up it sounds great. It is not boomy apart from in confined spaces, its fine on a long drive and apparently sounds great when you drive off into the distance With the car stock I noticed a lot better pick-up (despite having a blooming misfire every now and again)

I am a little worried now reading this thread though, in that I want to go the 3071R route... Hopefully the de-catting should counter the effects of smaller bore.

I seem to remember MRC saying this was a really good exhaust to tune with on a thread here before I bought it which was partly why i want for it. Fitment is excellent as is the one on the S3, and I got 30% trade discount

how much was it out of interest?

[Rusty]

Really want to hear yours mate as it sounds like the best of both worlds and not a PITA to fit over the diff etc at the back.

I'll need a system from turbo to rear axle (planning on using my current 2.5" back box) when i do my engine swap, may as well go 3" if i'm getting it fabbed up anyway.

for me 2.75" doesn't make sense unless its an off the shelf system, its not much of an issue to go 3" and far better performance benefits IMHO

You'll not have a problem, mine was so quiet that we ditched the centre section with minimal increase in noise. I think this did have a lot to do with the rear silencer tho so I don't know how your existing one will work and you won't have a sports cat...