If you want to run SLP headers and all after market exhaust which Random Technologies Straight pipe-or-Cat's do you use the one for the other guys headers or the one for factory manifolds?

I believe neither...I have the R/T Downpipe/high-flow cat and it ONLY mates up to the factory manifolds or ZZPerformances ported mani's...With TOG Headers, you have to cut the downpipe portion off of the R/T Cat...same goes for the SLP Headers...I know, sucks, don't it? I am looking to buy headers also...TOG's are the way to go if you have the extra cash

Well i really like SLP plus i get a deal on it (im a dealer) so i cant do it till my warranty is up but it was a curiosity thing...

I have heard of some probs with the SLPs matching up. A guy in our club will install TOGS for free but wont even mess with SLPs. Both headers come with the 3" flex pipe that will replace your down pipe. That is also what you get half of the 20 HP rating on headers off of. I am porting my own stock manis just like ZZP's and will have them ceramic coated. With my d-pipe they will be close to headers and a hell of a lot cheaper. But if you have money TOGS headers are the way to go.

A cheap alternative is s&s headers they are only $349. uncoated .

The SLP's come with the downpipe. Then you have to use the SLP cat with the rear O2 sim. I don't know if there is another alternative. The downpipe's flex part makes an unreasonable amount of ticking noise. You have to wrap it well with thick header tape.
Jack