ok so i just bought a set of mac 1-5/8 long tube headers and mac power chamber h-pipe
my car was tuned with 1-5/8 shorty's and off road h-pipe, it was 90 deg in the garage that day with 17% humidity .
i'm go'in to a track rental friday and it's go'in to be 63 deg out , so my question is
.. if i install the long tubes w/the power chamber do you think i would need to retune my car since it was tuned with the current set up ... i don't have time to get it tuned after i install them...should i just run the car as is ? or if i install the headers do you think my tune will be way off and go lean ?
91 lx Hatch 6.0(STOCK SHORTBLOCK) LSX 412rwhp
ON 275 RADIALS
10.84 @ 127 on motor
10.18 @ 135 150 shot ( still need tuning)