2055hkr shorty headers and high flow y pipe are off being cermic coated for my 89 firebird I'm now looking to order cat back exhaust and want to order the hooker supercomp 16820hkr cat back system but worried about loosing torque or performance in general with a stock 305tbi seeing how they only make 170hp and plus won't be running a cat ... any info or experience would be appreciated! Once exhaust Is done I'll be looking for 373s or 410s for my rear end to really wake it up and thinking a chip and tune to accommodate the exhaust and get maximum performance