Engine lays down

[BilLster]

sound doesnt indicated flow what type of exhaust are you running and how old is it compared to the motor.

you can loosen the header bolts or colector bolts and see if it doesnt drop off if this helps you will have to drop the exhaust to check it properly. i once had a peice of muffler brake off in such a way that it would only bend inside the muffler and restrick flow under hard acceleration. my dad finally guessed it was something inside and we cut it open and there was this piece of flexible muffler just infront of the outlet tube. (only took us 2 months to find it. the car sounded healthy the whole time .)