k... now that i've gotten it running good...

is there any k&n or other brand cold air or short ram intake tube/kit for my 89?

also... is there any easy way to put dual pipes on it (from stock muffler location)... and when i say duals, i don't mean side by side, but like symmetric on each side of the bumper (straight out the back) I have plenty of exhaust parts at my disposal... so, anything is cool. i wanna put a magnaflow on it.

any other cheap performance mods? chip maybe?

No, no off-the-shelf CAI kits, but;
Most, if not all your questions will be answered by reading the "Performance" section of TECHINFO at the top of the page.
Examples:
First Performance Mods

Exhaust Mod Recommendations

Dual tail pipes? Use single in/dual out Magnaflow muffler.