is stock exhaust THAT restrictive?/exhaust que.

[wezo00]

À ta question initiale... Non tu ne sentiras pas un gain substantiel de performance avec l'ajout unique d'un catback. Le downpipe ajoute plus, mais le catback est un bon début (pour le son et comme "pré-" downpipe).

[chef]

alors..pour ta voiture..avec to tune...as tu change juste le cat-back ou appres, tu as change aussi le downpipe? ton cat-back est 2.5" ou 3"? t'as vue un peut de "Gains" en performance? ou juste le son? merci
fabs

[wezo00]

J'ai seulement le catback de EST pour l'instant (avec remap RICA). Le downpipe Ferrita sera installé en même temps que le nouveau turbo. Je ne peux donc pas te quantifier le gain avec le downpipe. Et même après, ce sera difficile de déterminer ce qui appartiendra au DP et ce qui appartiendra au nouveau turbo, et même au nouveau remap.

Le catback de EST est de 2.5" (en fait, 2x 2" avec une sortie de 2.5"). Pour du 3" tu dois aller dans le custom.

Tu peux aussi te faire faire une soumission chez Federal Muffler pour une ligne 2.5" en inox. Sans doute moins cher que le catback EST.

[chef]

hi guys..been looking online for fun,but doesn't seem to be and exhaust stuff for my year/model car (2006)...is there something different with my year car? or will the older year parts work?thanks..fabs

[wezo00]

Fab,

Here is the catback for 2.5T FWD 2004-2007

2006 est inclus dans le "2004-2007"...

Et si ton 2.5T est AWD c'est celui-ci.

[chef]

Merci Mario

[wezo00]

Mais regarde aussi du côté d'un spécialiste custom comme Federal Muffler. C'est pas nécessaire de payer pour un résonateur et un silencieux chromés (EST)... Juste la-dessus tu peux épargner plusieurs dollars.

[chef]

oui tu as raison...but i've also been thinking of installing a 3" downpipe...i just want to make sure that it will also be legal (o2 sensors) and not just a "Free-flow" one...and then 2.5" all the way down....you think federal would be able to do all this? thanks
fabs

[rj240]

oui tu as raison...but i've also been thinking of installing a 3" downpipe...i just want to make sure that it will also be legal (o2 sensors) and not just a "Free-flow" one...and then 2.5" all the way down....you think federal would be able to do all this? thanks
fabs

Federal can do all that...

[DaveV70]

Hi Dave, i'm a little confused, if you go with a larger downpipe but then go back to the smaller stock exhaust, won't it be causing some back-pressure? was thinking of keeping it stock before cat and bigger after that...with a nice deep exhaust tone....thanks
fabs

Sorry Chef !


Kinda forgot this tread !!

Because as close as the exhaust gas are from the Turbo the hotter they are and so the more they expend... Stock exhaust size on our p2 T5 ( I'm assuming it's the same for 2.5T ( Wezo00 or Roger can confirm ) is in the 2.5" single tube exhaust...

So have a 3" downpipe will help evacuating quickly the exhaust gases from your turbocharger and go threw the 2.5 tube... Also considering the wave of the air pulse, the faster the engine turns ( or the higher the rpm's are ) the fastest the air comes out of the exhaust tube so the longer the air pulse or airwave is, which result in low possibilities of scavenging, that's another story but my point is that you need some back pressure ( up to a point ) to help that air to go quick and fast enough...

The point of the cat is quite simple: 4 peak whp difference between the 2 exhaust setup is POINTLESS to not having one... Because through all the rpm range you won't feel the difference on the buttdyno for sure !

[chef]

so just to know though...was is the stocks downpipe diameter? 2.25"??? just wondering if it is that significant...also..can i use the original cat ort do i need to get a 3" one as well? or can they cut before cat and attach the 3" to that one? thanks
fabs

[DaveV70]

so just to know though...was is the stocks downpipe diameter? 2.25"??? just wondering if it is that significant...also..can i use the original cat ort do i need to get a 3" one as well? or can they cut before cat and attach the 3" to that one? thanks
fabs

I don't have years of experience, knowledges or friends heavily involved in Volvo extrem tuning like in the VW universe... But the logic is the same...

I have no clue for the stock downpipe size, Wezo00, GunVolvo or rj240 will be the guys that may answer that...

As for the cat size questions.. IF you go for a pre-made DP solution, the pipe and the oulet will all be made in 3" tubing so I'm assuming that if you want something straight foward with no "on the spot modification" you don't have the choice to go high flowing 3" cat...

But if you go with Federal for something 100% home made, they can do you a full 3" downpipe and a reducer from 3" to 2.25-2.5 or whatever the stock inlet tubing size is of the stock cat !

Personally, I'm looking for this product...





http://www.phuzzymotorsports.com/ind...od&productId=2