I am stock with Catback Exhaust and K&N Intake.

I have heard that i need a DOWNPIPE ONLY and NOT
the midpipe between the downpipe and the catback.

IS THIS CORRECT?

WHY NOT on the midpipe?

any info is helpful....

also, which is a good one for cheap?? (downpipe)

 

the downpipe replaces the pre-cat and the midpipe replaces the main cat. It depends what you WANT to replace? If you want, you can buy both, none or one.

Danny

 

you should start by replacing the downpipe first and then later on the midpipe (with the appropriate fuel mods). If you replace the downpipe, your engine temps will be lower, the turbos will breathe better and also the car will have a lot more power. As far as the midpipe is concerned, it will give you substantial horsepower gains (provided your car doesn't run lean) but if you remove the main cat and replace it with a midpipe, the car will be obnoxiously loud and also stink too.

 

But what about presilencer?

 

Don't forget about the boost creep

 

get both but also get a boost controller, even a manual one should be fine for a while!

 

Check out this thread:

https://www.rx7club.com/forum/showth...hreadid=127096

It should have enough information for you...

 

got both of them for less then 400. Just make sure you have a boost guage and watch out for those boost spikes that you might have during the turbo transition period. seriously, you can say bye bye to your engine if that happens. In any case, also get a air/fuel guage, you'll be able to know if your car is running lean on WOT. DP and MP create huge hp gains on twin turbo cars, but especially on the rx7's you need to take your fuel system into consideration.. all the time!!

Nathan

 

don't do a mid pipe yet...with a full exhaust and a stock ems...your going to regret it...booooom!!!! there are many many threads going over this issue...good luck...

 

The voice of reason. You will most likely see boost creep (I'm not talking spike--that's the least of your worries) with a full exhaust and stock (read: unported) wastegate. Go with a high flow cat. I know where you can get a quality one--PM me if interested, or if you have any more midpipe questions....the motor you save may be your own .

 

does it really stink? if i were to go with a full exhaust like the one Border-Racing makes (the burn-out type II) would it smell? would i run lean?

 

Yes, and (with a stock ecu) YES. It will also be as loud as all holy hell and attract cops like you can't believe. Don't forget about the foot-long flames when you let off the gas

 

aww. i don't mind the loud as fuckiness or the flames but bleh, i don't want a stinky car
so even if i have no other mods beside full exhaust, i will run lean ?