gatty

hi chaps.

just about to buy a de cat down pipe tommorrow.

i allready have a nur spec r and hks equal headers .

so the question is do i go for a 2.5" or 3" de-cat downpipe?

p.s future mods are: f/m/intercooler and bigger turbo, so please bare that in mind.

thanks

Maz

iTrader: (34)

Three inch definitely. The more you can reduce back pressure the better. The bigger diameter will pay dividends especially with your future mods.

gatty

thanks maz

WRX_Rich

iTrader: (5)

you know you should get that lot remapped after fitting

and go 3 inch as your nur spec r will be

gatty

jolly green giant is booked in next week, cheers richieboy

WRX_Rich

iTrader: (5)

no probs

are you fitting your self?

gatty

a friend iss fitting the kit why?

Ian

iTrader: (10)

what does this sound like with the equal headers, do you still have the burble or what does it sound like? better power with them.

also i think the nur spec r goes down to the standard bore size where it joins the downpipe.

i have a 3" decat down pipe, and it fits my bur specr good.

Mangel

I've got equals and an Sti Genome, sounds like a big jap bike basically!!

Maz

iTrader: (34)

You mean Jolly Green Monster aka Simon, a top bloke.

WRX_Rich

iTrader: (5)

good choice !!!!

i fit mine my self, and wondered if you needed any advice

andythejock01wrx

Good choice Gatts !

andythejock01wrx

Thought 3 inch was only worthwhile over 400 bhp ?

Or are we talking about Napoleon and Josephine here ??

gatty

sorry sweaty that one has gone over my head

andythejock01wrx

Ok, so the allegation was in fact that Napoleon had a one inch ****, but anyway, you get the drift......

Maz

iTrader: (34)

The more you can reduce back pressure the better, infact if the turbo was dumping straight into the air without an exhaust that would be best. given Gatty's future plans he won't be too far from 400bhp, although I don't think there is a threshold figure when using a bigger diameter. TBH a lot of people are using three and a half inch diameter with power outputs of mid 300 bhp.

WRX_Rich

iTrader: (5)

a 2.5 exhaust is said to give better off bost response a 3 inch exhaust will give better on boost and spool, to be honest i don't think you would notice to much bellow 400 bhp

your headers will give a little more lag but add more to the top end

Jolly Green Monster

iTrader: (4)

the nur spec r has a 3inch connection to the downpipe iirc so I would be inclined to go with a 3inch open neck downpipe.

See you next week Gatty

Simon

gatty

thanks every one! see ya soon simon