\'86 Exhaust Question!! Ive got an 86 blazer, and I want to put a cat-back dual exhaust system on it...everything ive seen in JC Whitney,Performance Products, and even Flowmaster...dont give any info or offer a system like this...was wondering if there was a reason for this? Is there something about the '86 models??..I've found some for '87's...?? weird. thanks for any help!!!