FallenCho

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I've read tons of posts about how you have a serious chance to overboost after changing the downpipe and/or midpipe due to all the air that is now unrestricted to pass through your exhaust system. Unfortunately while having my turbos replaced my mechanic saw that my downpipe was cracked so I gave him an aftermarket downpipe & midpipe(both 3") to throw on there which he is gonna weld a high flow cat to the midpipe.

So now I'm gonna be running on intakes, dp, high flow mp, and exhaust. Now I'm very paranoid about driving the car after this is done cause I don't have an ECU which I'm currently looking for a good priced one(he's offering to do an AEM ECU + tune + dyno for 2k). Just wondering if I shift at 3-3500k should I be fine til I get that ECU?

Just curious: but there is a kid around here who was running a DP, MP, and exhaust with no problems and he had no ECU. Just something that makes me wonder.

*hears the "search" post coming on* but I've never seen anything pertaining to how hard you are limited to pushing your car. Don't know if it changes drastically with all that air flow or not.

rynberg

You couldn't find anything in a search? This type of question is asked almost daily!

With a hi-flow cat, you will not have boost creep problems. However, you WILL have elevated boost. You WILL need a boost controller (either manual or electronic) to maintain boost at the stock level of 10 psi.

Unless your mechanic has a LOT of experience tuning AEM ecus and turboed rotaries (ask around), I would be hesitant to trust them. Also, $2k seems an awful lot, since you can get a plug-and-play PFC for under $1k and have Steve Kan tune it for under $500. Then again, given your location, you may not have many tuning options. Perhaps a better solution would be to just pick up a used Pettit ecu for ~$400 and then you can run 12 psi with no tuning concerns.

Just because some other person has supposedly run with no problems with a midpipe, doesn't mean it's a good idea. You never know what other mods have been done to run that setup safely -- or not! He could blow the motor next week too....

FallenCho

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Yeah the guy down here who does the tuning has many years of experience behind his belt in tuning turbo charged vehicles. Besides that many customers are extremely satisfied with the work he does. I'm probably gonna head the PFC route since it's much cheaper and us FD owners need to whatever we can to save money for that next rebuild.

Thanks for clarying my question. Yes I've seen tons and tons of posts on this but the majority are concering straight though midpipes. Seeing as how most people go the high flow route after having a straight MP for a while due to the excessive noise it produces. Just needed to know the dif between having a straight pipe and high flow cat.

Montego

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