hey guys just wondering will there be any performance difference if I brought some extractors of ebay if there not a pacemaker brand?

Unless you're chasing a tenth of a second, at the drags, No.

Extractors work much more efficiently than any manifold will. The 6 cyl in factory trim, is a little stifled for air flow. Genie, Hurricane, Redback, Pacemaker will all work better than stock. Cold air induction will help a little also. More air in, more air out.

i agree with bear, an engine is essentially a pump, more air you get in and the more you can get out, the better performance. Cold air intake, bigger cat, exhaust, etc. should get ya engine breathing better.