well obviously, a midpipe would be better...

but, right now i have a downpipe, and the gutted cat. would it be worth the money to buy a midpipe to get rid of the hollow cat, or would it be fine to just leave it on there for now? i would think it would be /almost/ the same, but i dont know how much better the midpipe will flow. TOO much flow wouldnt be good yet, i am still on the stock computer. tell me what you think
thanks

 

gutted cat and stock ecu has been working so stay with it untill you get a computer.

 

do you want your car to be fast for a few months or to have a motor for a few years

running a midpipe or cleared out exhaust on the stock computer is the most affective way to help add to the unreliable name that the rx-7 has

Even on an upgraded computer I would be extremely worried.

If you can find a way to keep the boost to 10 psi no matter what and are confident in this method go for it

 

i have stock exhaust still on it.....all i have is downpipe/gutted cat. i thought it was the rule of 3 for being worried about boost/computer?

 

sounds like to you need to start saving those paychecks like the rest of us and join the crowd; you need to get the Power FC computer, midpipe, exhaust and intercooler and then have a good dyno shop tune it.

 

The 3-mod rule doesn't work. Check out wade's site here for the proof (several of us have also verified it ourselves):

http://www.newwave.net/~flanham/wlan.../3modrule.html

A midpipe/gutted cat is a very major mod on an FD. I think it is insane to run one with the stock ecu because of the boost spiking and creeping that tends to happen. Either get a hi-flow cat to replace the gutted cat or do not do any more modifications until you can get an ecu. Getting an intake or cat-back exhaust would be very risky at this point. In fact, leaving things the way they are is risky. Get a boost gauge and verify what your boost readings are, especially at the transition and in 4th and 5th gear (higher engine loads --boost creeping situation).