I'm looking into putting a set of headers on....gonna go with pacesetter LT's unless I find a good reason not too. But I'd like to know what the performance change would be if i went with true duals all the way back compared to just putting on the LT's w/ a Y pipe and running stock exhaust back to my cat-back......The lack of ground clearance has me a little skeptical of the true duals......btw it's for the car in my sig w/ plans of a 150 shot of nitrous.........Thanks

A friend of mine with a blown 383 LT1 in a 30th SS convertible was pushing 1,125HP through Hooker LT's with a Mufflex Y-pipe and Mufflex 4" catback. To save weight, he removed the Y-pipe and catback, and ran nothing but 3" Borla XR1 mufflers on the Hooker collectors. There was no measurable difference in HP at the rear wheels. He did save 50# though.

Hard to compare exhaust performance on a blower motor with an NA engine, but I suspect the need for a large exhaust on a nitrous engine would be in some ways comparable to the blower situation.

I ran a set of AS&M mid's, with the drivers side flange modified so the exhaust could be run straight back, instead of around the front of the oil pan. We were not able to see any significant HP differences of running a custom Mufflex 3" Y-pipe through a 4" Mufflex catback, versus a simpler exhaust consisiting of the Borla XR1's on the collectors, 3" pipes back to the axle and turndowns. Again, the only gain was weight reduction. That's for an 800HP nitrous combo.

well I already have a flowmaster cat-back so maybe I'll just get the headers and leave the rest alone......I'm planning on Pacesetter LT's, should i get the pacesetter Y-pipe to go along with it? Also Im probably going to remove the Cat since emissions isnt much of a concern around her....would it be worth it to run a larger diameter exhaust from the Y-pipe back to the catback? I'm not sure how big that is from factory......Thanks

Just get a cutout. much cheaper, and lose the flowmaster while your at it.

I dumped mine, best thing i ever did.

whats so bad about the flowmasters?

People sometimes take outdated info on flow tests for some unknown Flowmaster muffler, and extrapolate it to include ALL Flowmaster mufflers. The Mufflex systems I described above both had Flowmasters. There are good ones and bad ones.... varies with the specific model.