need advice in my 1995 2G

[j-jamrod]

hey guy i took today mi car to the track after i put on it a set of brian crower 280 with springs, i just got the las version of MAFT, im still running the 450cc injectors, and a stock 14b turbo. Also i have the black top CAS conversion because im running actually a 2.4 6 bolt with a 2g head. The engine have a stock compresion of 178PSi for cylinder. But im having issues with the car almost dyng at 4000 Rpm, and having explosions in the exhaust. the Maft is adjusted 4,2,0,0,0, and im curious if probably the issue is the maft, or the cas. Please if somebody have any idea....