I am wondering what would be the best BOLT ON muffler tip for my 96 2dr 4wd blazer. Right now it's just too quiet and i want it to be a lil louder and more aggressive.

 

Get what pleases your eyes because the tip has no effect on the sound. That is determined by everything between the engine and the exhaust tip.

 

& a tip will only make minor changes to sound unless you get a resonator tip & remove the muffler. Streblo in here has done that & he has vids so you can hear how it sounds, look him up.
Exhaust sounds change with the size of pipes, cats or no cats, muffler of course, headers (useless on a stock 2nd gen blazer except for sound).

Search around in this header for ideas & what should & should not be done IE: too large of exhaust