Up pipe/Down pipe

[NTYCME]

Pro's and con's of these?

heard that one improves mid range response?

[Wiretap]

You haven't heard of google have you? this question could easily be answered there.

Up-pipe: don't bother, factory one is fine, using a larger diameter aftermarket up-pipe will just slow your spool down as there will be less gas pressure and velocity feeding the turbo

Down-pipe: depends entirely on what you use, the factory one _is_ rubbish though.

[Pappu1]

 Wiretap said:

You haven't heard of google have you? this question could easily be answered there.

Up-pipe: don't bother, factory one is fine, using a larger diameter aftermarket up-pipe will just slow your spool down as there will be less gas pressure and velocity feeding the turbo

Down-pipe: depends entirely on what you use, the factory one _is_ rubbish though.

hahah aagreed ully abt the up pipe thing (unless u got like some monster turbo etc maybe then - dunno)

easy up to 20kw gain with a bit of tune with a dump pipe - fully recomend getting that

[funkytown]

 Wiretap said:

You haven't heard of google have you? this question could easily be answered there.

Up-pipe: don't bother, factory one is fine, using a larger diameter aftermarket up-pipe will just slow your spool down as there will be less gas pressure and velocity feeding the turbo

Down-pipe: depends entirely on what you use, the factory one _is_ rubbish though.

not stirctly true imo.

Only with turbo and exhaust housing choice, and then measuring back pressure pre and post turbo could you be making true determinations about up pipe size and its effects on back pressure spool characteristics.

*on a stock VF turbo and ecu, going overly large compared to factory uppipe size - yes will do what you've mentioned.

[Guest]

you can buy aftermarket up pipes standard size too. do you have a cat in the up pipe? if so gains could be had and it wont fragment through your turbo ever. the subaru up pipe has a few nasty joins too that cant be good for flow.

down pipes seem to make a good difference. bell mouth with splitter seems preferred if running internal.

[ADIKT]

 evowrx said:

you can buy aftermarket up pipes standard size too. do you have a cat in the up pipe? if so gains could be had and it wont fragment through your turbo ever. the subaru up pipe has a few nasty joins too that cant be good for flow.

down pipes seem to make a good difference. bell mouth with splitter seems preferred if running internal.

not common in nz new or jdm cars

[Pappu1]

have seen up pipe cat in nz new v7/8 wrx only so far

[johnny5]

 pappu said:

have seen up pipe cat in nz new v7/8 wrx only so far

yea no cat in my down pipe that came off the car. go the 3 inch DP

[WRXONP]

definatly upgrade downpipe - wether its siamese or divorced - 3 inch is best for flow - the exhaust is where the easiest power gains can be made - very effective

i ran one those nasty up pipes on my ver 3 sti - then changed it and dynod again - boost came on much faster - even the bum o meter said it was faster

and the stock up pipe is by no means a restriction when running a VF turbo or any facto position turbo -