quick question

[kousoku]

umm, just putting any gerneric header (4-2-1)[aus brand] and a high flow cat on a dc2, would you be guareented some sort of gain? ie. 1kw or something?!
or would certain circumstances cause a power loss?!

just intersted and i know this has been covered heaps just want a quick answer.
thanks

[SKREMN]

your money is well spent
do you have the rest of the exhaust to go with it?

[kousoku]

i'm still unsure of which b pipe and muffler to get so yea,
just the start of exhaust i have. =D

[typsy]

well, if the header hasnt been dynoed, then you wont be 100% sure that it will gain you power. In some cases you can actually lose power. I have a mugen copy header and regretted it, lost power in the lower band. Just ordered myself the original mugen 4-2-1 header. So dont do the same mistake as me.

[Willxia]

it really depends on how big is the piping it self
and you need to look at the mid range rather than top coz you don't always hit top

[typsy]

i'm still unsure of which b pipe and muffler to get so yea,
just the start of exhaust i have. =D

what's the size of your header collector? you should have the same size piping thru out the whole exhasut system. Eg. 2.5 inch collector would require a 2.5 inch cat and a 2.5 inch b-pipe for maximum flow.

[kousoku]

could you put a 2.25 high flow cat on the stock vtir b pipe?

[typsy]

yeh you could if you want, no1 is saying that you cant. Its just better if you match the entire exhaust system with the same size piping. is the stock VTi-R b-pipe 2.25 inch?

[kousoku]

i donno , can't find anywhere that will tell me. :(

[kousoku]

vtir is 2 inch.
so what do you rekcon,
worth isntalling 2.25inch cat and header on stock 2 inch b pipe?!
quick quick!!!

[typsy]

ok i just found out for ya from www.dohc-vtec.com.au. It's 2 inch. so go find yourself a 2.25 inch b-pipe.

[typsy]

vtir is 2 inch.
so what do you rekcon,
worth isntalling 2.25inch cat and header on stock 2 inch b pipe?!
quick quick!!!

then whats the point of gettin 2.25 inch headers and cat in the 1st place if your going to leave the stock 2 inch b-pipe. Your totally breaking the flow. Just go look for a cat-back exhaust with 2.25 b-pipe.

[locote]

i put itr header on my gsi and gained 5 kw with stok pipes, then i gained 6kw with 2.5 inch exhaust,

[THE_MASS]

i think that it would be better off getting a 2.5' collector with the B pipe as you would get better air flow. i dont think that it will be worth while because you might not like the upgrade so to speak and would want to spend more money on the cat and collecter anyway. if you know what i mean.
i think you should just wait and get 2.5' all the way:)

[THE_MASS]

then whats the point of gettin 2.25 inch headers and cat in the 1st place if your going to leave the stock 2 inch b-pipe. Your totally breaking the flow. Just go look for a cat-back exhaust with 2.25 b-pipe.

correct me if im wrong, but isnt the standard piping in a VTiR 2.25' anyway?? :rolleyes:

[kousoku]

nah just checked and its 2.00

the type r for most of the length is 2.25, the rest is a little bigger then 2.25

[THE_MASS]

i still think it wouldnt be worth it. save your money and get 2.5' ALL THE WAY:D :D :D

[locote]

with the 2.5 power doesnt realy come on till 4000rpm but thats when the engine note gets angry