LMC Truck has a cat-back exhaust that says fits longbed and short bed s10s. My question is since S10 and S10'Blazers are basiclly the same truck will the cat back system fot my my 4 door blazer?

 

Chances are it will fit do to the frames being similar. The exhaust may be a bit longer than needed for your blazer due to the difference in length. The S10 pickup is a bit longer than the 4 door blazer.

 

The 4 door blazer is 11-12 ft long if that helps.

 

If the cat back system would fit either the 1st or 2nd gen Blazer, I am sure that LMC would list it. Why? Because it would mean more sales for that existing product. Why don't you call the LMC customer rep.s and see what they say. Please let us know what they say.