Hey all,

I'm considering my options on upgrading my stock '03 CL-S exhaust. Can anybody break down the approximate HP/torque gains that each component of the Comptech exhaust system will give?

-Headers: ?
-B-pipe: ?
-Axle-back: ?

If I only do the headers first, will I get a nice performance improvement or will the stock exhaust hinder the impact of the Comptech headers? If I do the B-pipe after the headers, and leave the stock mufflers for now, will I get even better air flow (than with just upgrading headers) even thought I've not changed the mufflers back yet?

I've heard on these forums that the axle-back exhaust gives the least HP gain (1-3 HP), so it seems to me that this component should be the last thing upgraded. Does this make sense?

Thanks for any help!

Brian