been looking at extractors for the xr6, the pacemaker competition extractors arent much more expensive than the 4490
4490's\

4495's
now what i would like to know is would they both offer good ecomony over the standard exhaust manifold/ is the power difference between the 2 noticable at all?

and question #2.

in the advertisement it says the euro 3 200 cell cat will keep the engine light from coming on, anyone had experience/opinion with a high flow cat not affecting the engine light?