Quote:
Originally Posted by RabbitZL1
Up to a certain point. I myself tested this. Gained exactly 2mph at the track. Didnt totally eliminate the muffler, only added cutouts before the muffler. The muffler itself I would say up to 900 there has no major effect on hp. I was told by Justin Keith that he lost 3mph from replacing the oem muffler with aftermarket mufflers. (air caught under the rear bumper). He goes 9.50s.
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Thanks Rabbit, certainly proves that there is some truth to it all.
For anyone interested, i used some cardboard as a template and cut out a profile to “fill in” the cavity and in effect make the rear portion from the diff to bar as flat as possible. Once happy with the profile simply traced it onto some Marine grade alloy sheet 1/16” (1.6mm) thick (Grade 5052 much better corrosion resistance than normal alloy).
Few pics of before / after plate fitted.
Pic 1 taken from under the diff looking towards the rear bar.
Pic 2 taken from under the diff looking towards the rear bar after plate fitted.
Pic 3 pic from rear of car.
It certainly was a lot easier than i thought as the plate is almost flat (no curvature required). I'm surprised the high end Exh companies don't offer this as part of their system. They could easily have the plates water jet / laser cut to suit their particular systems.