I have a to the best of my knowledge a bone stock aluminum ls1 I was told 98 but came with a 99 computer no Dyno tuning yet no wide band measurements the car is a 6 speed 37 Chevy sedan with 4.11, 29 inch tires, block hugger headers, 2 1/2 exhaust no cross over with flowmaster one chambers, with street and performance machined mass air and air filter the car put down 347rwhp and 315rwtq this just seems a little high to me since the engine is rated 348 flywheel

 

A little high, but bone stock f bodies put down 290's to 300's. You have basicly, shorty headers and duals and a better breathing air intake setup so its possible but still a little high, however I have seen it before

 

mine was 335 thru an auto and lt's.. ls1 intake stock tb

 

Mine made 326rwhp / 321rwtq, with just a K/N filter everything else was bone stock. 6 speed trany.