Best fitting LT?
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The Best V8 Stories One Small Block at Time
However, there are always bad stories for each.
I have Kooks, they fit HORRIBLE, and needless to say, i have gone back and forth many times and they tell me that they fit fine... (if you like it bouncing off your K-member)
But on another note, every company will have good parts and bad parts. This is because the quality control on aftermarket parts as a whole is quite poor. Going with Kooks or QTP may reduce your chances of having bad parts, but wont eliminate it.
are poly motor mounts required for the headers/y-pipe not to slam around in the car?
They are inexpensive, will help to prevent any exhaust banging and just generally make the car feel tighter. If you ever decide you want poly motor mounts after you put you're headers on you will be kicking yourself!
Here is a badass writeup written by me
https://ls1tech.com/forums/generation-iii-external-engine/492703-best-poly-motor-mount-write-up-ever-written.html



