Have Exede with 93 octane stock map. Put on Buschur down pipe, high flow cat and cat back exhaust. This is the only other mod other than the Exede. I am getting sputter at about 6,000 rpm at WOT. I don't have a boost gage. I'm I getting into a high boost condition and the ECU is cutting boost causing this sputter? Help!

 

You can check leaks and tighting down all the screws, but you really need a boost gauge, any after market bov???

 

sounds like the ecu is pulling timing due to knock might want to get it tuned

 

check your fuel pump...i had 2 go bad on me and the same thing happened...

 

may be getting boost cut, your Stage Sub Zero boost map may be at 100% like mine was.

Get a stage 0+ map with adjusted boost tables.

 

Sounds like boost cut. Might want to hook up boost gauge to see what is going on. Also, try dropping the values in your boost table by 10% to see if the problem goes away. If it does, it was definitely boost cut.

Shiv

 

Also, to add on to what Shiv had to say, I would swap out the old plugs for some fresh ones. Sounds like your car could be expeeriencing an ignition related misfire.

If lowering the boost, and chaning out the plugs does not fix the problem, you may want to find a local evo guy to swap coils with. The coils on these cars can be somewhat hit or miss.

Good luck.