Alright I already know that TTI is the best but I just can't afford $800+ for headers and still get my car on the road.Soooo,what kind of experiences do you guys have w/heddman,hooker ,thorleys,etc...I've got a 440,9.75-1,mp.528 cam,3.91's,3000 stall,going in a 70 challenger r/t.Super bowls back on so I'll check back later,oh ya 1 7/8" or 1 3/4" primaries,does it make that much of a difference for a mostly street driven car?Thanks in advance!Matt