99greenwagon

iTrader: (39)

hi,do these work ok?,do they give good flow? or are the 3" reducing to 2.5" ones much better?

jura11

iTrader: (7)

2.5" is good up to 400-450bhp and 2.5" is little bit louder than 3".




Jura

99greenwagon

iTrader: (39)

damn,i was hopeing that the 2.5"was quieter.

jura11

iTrader: (7)

Yes will be if you are go for resonated center pipe something like this with good backbox






Jura

99greenwagon

iTrader: (39)

no i am going to leave the oe system on,by fitting a mild steel 2.5"(all the way through) decat downpipe and leaving the oe system on will it still be nice and quiet?

jura11

iTrader: (7)

Yes will be quiet with OE system.But you will need remap or drive off the boost matey.

Jura

99greenwagon

iTrader: (39)

i know that mate,just need to know that a 2.5" decat will do the job to reach 300 bhp,and if it will be quiet with the rest of the system being oe.

jura11

iTrader: (7)

Yes will reach 300BHP and pass 300bhp with right mods,and don't be restrictive for some point later.
I don't think so will be loud


Jura

99greenwagon

iTrader: (39)

so what are the gains/why do they make them 3" reduceing to 2.5 aswell? whats the point?

jura11

iTrader: (7)

Why?
Here is mine answers,some people have OE Spec system(backbox and center pipe) and want use with new decated downpipe 3" or 2.5".
Some people say about 3",its due back pressure,and i would recommend go for Bellmouth,because is less restrictive like standard DP
Here is picture how it looks



Jura

99greenwagon

iTrader: (39)

ok thanks.

Brun

2.5 = more noise? I never knew that. I assumed it would be the other way round.

99greenwagon

iTrader: (39)

me too.

jura11

iTrader: (7)

Some 2.5" exhaust are really loud,but this is depended on backbox and center pipe,not on just downpipe.



Jura