i not to long ago posted the difference between the 21/2 in corsa and thew unique 3 in system my kids came up with . the car with the corsa the car with the corsa went 12.71 114.77 with the change over done between rounds on the same day at fointana the car went 12.23
.@116.40 the 3 in they came up with had a unique dual crossover witch was a 3 in wide by 3 in deep reqtangular pipes that look like 2rulers done at the area where the pipies bend to go down the tunnel . they then put in 2 21/2 in super turbo mufflers. they then changed to 3 in super turbo mufflers and found that the et got better but not the mile an hr . hopefully i can get to bill boudreaus house to take some pics to show what they did . all i can say is this exhaust makes more poiwe than the corsa and is even quieter than the corsa also . i do believe that it is the best of both worlds unless one wants a very loud exhaust . i will say i dont like the collector that stainless works puts on their headers