Downpipe HFC or Not to HFC.

[anm6]

Hi guys looking to get a DP for my MS3, But was wondering if a should go with A HFC one or not. Thought I read on here about boost creap with out a HFC?? Also WTH is a long DP and a Short DP??

Thank you

 

[BoostisLove]

Well, when i buy a downpipe which will be shortly theres no way im getting one with a hfc. Idc, straight pipes ftw.

 

[JS + MS3]

if you don't get one with hfc, you will have a chance to get that CEL code.

 

[skatethesea]

there was a great article in Import Tuner about a year ago or so. It posed the question of High Flow Cat vs Test Pipe. They ran the stock cat, a HFC, and a TP. Regardless of what the gains were in total. It was the difference in TP to HFC that was more interesting. They could only find a loss of less than a HP to the wheels between the HFC to the TP. I run a TP on my S2000, but if I do get parts for the MS3, I will go for the HFC.

(also, if you get a bung extension, you wont have to deal with CEL codes)


Cheers

 

[anm6]

Fun attical, BTW I have seen the WHP from test pipes to HFS where minimal like2whp difference. I'm concerned about the CEL and boost creap.Any have issues with these??

 

[zx2man]

People have success with both catless and catted downpipes. I have the Cobb downpipe which is catted. For Cobb maps it seems to work better than non cated, But a custom tune solves that. There is not too much difference power-wise with hfc dp vs catless dp..around 5 whp from what I recal with the CP-E downpipes...as for test pipe vs downpipe..I saw s2000 mentioned..with turbo cars its just way different story than n/a cars for exhaust mods..The downpipe part of the exhaust on the ms3 is what holds most power back..the midpipe=testpipe will yield some quicker turbo spool and a decent gain of hp. Typicaly its understood in the ms3 world that downpipes give 20-30 whp and the testpipe 7-10. Goodluck