Down pipe and decat Vs Standard

[dannyh]

Hi i currently have a cat back exhaust system that is quite loud ( Non resonated)

I am thinkig of finishing off the system with a 2.5inch downpipe and decat. Will this make the car any faster and will it make it any louder, its already quite loud and i dont know if i want it any louder

Would it be better to fit a sport cat, will this make it quicker and not as loud

Cheers

 

[Welly]

Hi i currently have a cat back exhaust system that is quite loud ( Non resonated)

I am thinkig of finishing off the system with a 2.5inch downpipe and decat. Will this make the car any faster and will it make it any louder, its already quite loud and i dont know if i want it any louder

Would it be better to fit a sport cat, will this make it quicker and not as loud

Cheers

And this is on what car?

 

[dannyh]

1.8 20v Turbo FWD

 

[Welly]

1.8 20v Turbo FWD

Ahhh, OK cool. That makes things a little easier.

Either go with the 2.5" or 3" downpipe and decat - both are MUCh less restrictive than the stock item which is quite frankly gash.

Won't make much noise increase, but will allow the turbo to spool up much better as the gases flow MUCH easier.

I had this one fitted on my A3: http://cgi.ebay.co.uk/VW-Golf-GTi-B...arts_Vehicles_CarParts_SM&hash=item20b2793b65

It was great, well made and an absolutely bargain to be fair. Easy to fit as well.

 

[dannyh]

what kind of gains do you think a 2.5 inch downpipe without cat will give and would this be the same with a sports cat

 

[Welly]

what kind of gains do you think a 2.5 inch downpipe without cat will give and would this be the same with a sports cat

The cat is irrelevant to be honest, sports cats flow as well as no cat at all.

It's not the cat that's restrictive as stock - it's just the downpipe.

Hard to say what sort of gains, BHP will be negligible, but turbo spool up time will be greatly improved.

 

[dannyh]

Hard to say what sort of gains, BHP will be negligible, but turbo spool up time will be greatly improved.

and spool up time inproves 0-60 times?????

 

[Welly]

Should do - will at least make a difference to acceleration....

 

[shanejess]

shove your finger up your **** when your just about 2 fart, thats how your engine feels like with a cat. 3ich down pipe and de-cat is what you need, people who say the standard s3 cat is as free flowing as a de-cat live life with their finger up their ****, i hope this helps your decission.

 

[devan]

But a cat will be needed to be fitted to pass an MoT right?

 

[djdougalno1]

But a cat will be needed to be fitted to pass an MoT right?

Depends on where you get yor mot done I have no cat and my car passes the emisions test for an extra £10 aslong as everything else is ok and safe

 

[s3dave]

public forum........

 

[Dazboss]

public forum........

Yeah true, dont want to loose your contact...

 

[Dazboss]

I've always gone de-cat tbf, but im not sure if i am going to. I dont even want to change the exhaust system.

 

[Welly]

sports cats flow as well as no cat at all.

shove your finger up your **** when your just about 2 fart, thats how your engine feels like with a cat. 3ich down pipe and de-cat is what you need, people who say the standard s3 cat is as free flowing as a de-cat live life with their finger up their ****, i hope this helps your decission.

For openers, it's not an S3.... Which have 2 cats. The A3 has 1. And I said a SPORTS cat is as free flowing as a decat.

 

[dannyh]

any one with a video of the exhast sound with decat, i am thinking of getting 2.5 inch downpipe and decat then a silencer neer the back so it isnt any louder or is this pointless and will it cancel each other out

 

[dannyh]

any one with a video of the exhast sound with decat,
i am thinking of getting 2.5 inch downpipe and decat but so it int any louder i want to get a silencer neer the back. Would this make it more restrictive and pointless and will it cancel each other out or would a silence/resonator neer the back before the backbox be restrictive

 

[devan]

Ive been looking on the ebay page for the Audi S3 PipeWerx 3" downpipe and high flow cats, and it says the Dog Bone Mount must be uprated before fitting the exhaust, why is this please?

 

[superkarl]

shove your finger up your **** when your just about 2 fart, thats how your engine feels like with a cat. 3ich down pipe and de-cat is what you need, people who say the standard s3 cat is as free flowing as a de-cat live life with their finger up their ****, i hope this helps your decission.

brilliant! :')

 

[dannyh]

sorry to keeosting the same think but i just want to know, will a silence/resonater be restrictive, if so how restrictive

 

[finny_quattro]

i have a twin cat on mine (1.8t quattro) im gona go for a custom 3 inch decat and down pipe..3 hundrea quid but the bloke at the exhaust place im taking it 2 said theres a law on cars after and before 2001...being you can get fined if its after 2001 but if its before the worst they can do is tell u to take it off...but if it passes their emissions test you are perfectly ok to drive with it on although the chances of it are canny slim! dont know if hes right but who knows? im going for one after he does my 2.5 inch cat back