I need to rethink the muffler system on my Hemicuda racecar, as it hits the ground on the Nurbrugring way too often. What low profile muffler would you recommend behind a HEMI that revs up to 7,500 rpm ? Which mufflers flow the most ?

We currently have Borlas with 3" inlet and outlet and a pair of Supertraps exiting both on the right side of the car, but they are both too low.

I'd like to put the muffler under the rear seat and then exit at each side without using the Supertraps anymore, but just an oval 3" stainless steel tube. To achieve that, the mufflers need to reduce sound more than the current ones, but without affecting flow.

Any idea is welcome