Hell yes it can!....that extra oxygen can come in and cause the unburnt fuel to ignite...I had a leak in my H-pipe when I installed it wrong....car would make a LOUD bang durring shifts....actualy blew off the smog air pump tube.....
Matt, 90' GT 347, 6037 heads, V1 Si-trim, 11psi, B31 Cam, T56, SV Intake, BE/Tweecer Tuned. 550rwhp 513tq
Bonneville 130 club member. (139.993) 11.48@123 in the 1/4.
03' Sonic Blue Cobra 497rwhp 481tq
13' Taurus SHO Performance PackDaily