Stan. I am taking my 88 Callaway twin turbo to my speed shop next week and I am having the 2 small cats removed and straight pipes installed. I am also removing the factory cat and replacing it with a walker dynamax free flow cat.The mufflers will also be replaced with dynamax polished stainless steel mufflers to increase the overall flow and add some horsepower. I imagine the horsepower should be at around 405 after the modifications instead of the current 382. Also thanks for some of the tips you gave me over the phhone last night.