OnequickRX7

Ok I have to replace my main cat with a midpipe, because it is clogged, and I already have a intake on, I have heard people say that I will be fine running a midpipe and a intake without a ecu, but then I have heard some people say that i need a ecu if I'm going to run a midpipe, can you guys give me some advise?

lane_change

iTrader: (20)

ECU first, then a midpipe. Boost will bite if your not careful. Why not a high flow cat?

Bucrx7

Well if you ONLY have intake and midpipe theny ou should be fine. You still have your very restricted downpipe and catback. If you add a catback then I'll defintely get an ECU.

GsrSol

You can do a high flow cat instead of mp if you want and not have to worry about anything.

Pumped

it should be ok, just keep your boost level at 10 psi

FastX7

What about just a downpipe and midpipe with everything else stock?

lane_change

iTrader: (20)

no midpipe!! Causes problems with boost control. One big spike and, oops there goes your engine. You only have enough fuel to allow 14.7 psi and after that you are in lean conditions. Not good.

bladz311

iTrader: (1)

i'd get an ecu first

FastX7

Is the HKS P-FCON unit any good? I haven't heard anything about it or can find any good info on it.

GsrSol

No way Jose!
I wouldn't attempt it.

FastX7

I'll be sticking the stock cat back on then. Well, what about a HF cat?

captkirk

get the downpipe first and make sure u get the pills to maintain stock boost..and then get the hi flow cat and ecu..after u get the downpipe..u can really hear the turbos singin !! but make sure u put the pills or u will over spike the boost..bad

FastX7

Mine didn't have pills, I checked the lines when I did a hose job. Someone told me that on some cars the turbos are regulated by the nipple size on the wastegates. Point well taken though.