Hallo Rx-7 friends, I am new to this Forum and would like to see if any one could help me with any information. I am from Aruba ( Dutch Caribbean)I own a Rx-7 TT '93. I Just bouth an HKS Carbon Fiber/Titanium Cat Back Exhaust System and installed it on the stock mide pipe and stock down pipe which is performing very good. Now I want to upgrade my Exhaust System with a beter flow mid pipe (catalist removal)and maybe later on installing a Down pipe. My questions are:

@Is it true that by doing this the engine will run too lean?

@Is it true that I should first install an electronic device/computer(to over ride stock computer settings) to avoid this problem?

@If it is a problem should I leave the stock down pipe when installing new hi-flow mid pipe?

Please advice, any info will be highly appreciated

Thanks in advance.

Samurai
Bushido "The Way of the Warrior"

 

I would hold off on the high-flow cat for now and just go with the downpipe for the time being.

This will give you a bit more power as well as make the car more reliable.

 

you engine will not run too lean if u install the DP. but after 3 mods or more you should upgrade your ecu before you start denotating. i would also install the DP before the MP because you will have less of a change of boost creep. if i were you i would get the DP then upgrade you ecu then add intake then the MP if you really want more HP.

 

Thanks for the reply's

Since I do not know nothing about upgrading the ecu (size)could you sugest me with some info on this and where should I look for it.

 

goto https://www.rx7club.com/forum/showth...997#post438997 theres soem info there about ECUs. then ask if you have any more questions.