need advice

[srv1]

Originally posted by chuck88
I have an 88 GT and I want about 300 hP.
Current mods GT 40 upper/lower Lower is ported
65 mm Throttle body
shorty headers, hiflow cats, H Pipe, dynomax exhaust
Cold air intake
3:55 gears

The mech. dyno tuned the car and I have 240 hp & 300lbs torque

Now the car is backfiring. He did correct the surguing idlke and stalling problem. (I plan on going back)

He says I might have to much intake.

Could this be true?
If so which intake do you guys recommend the mech. suggested a cobra intake.
is this a good choice?

should I go heads & cam ($2500)?
mass air conversion?

I am son confused


chuck 88

Is that 240 at the wheels?