I've got a Staintune exhaust system on my '82 LS, never noticed the right pipe was in farther than a stock exhaust sytem, have to look at it this afternoon .
First thing with an OEM oil cooler, the thermostatic bypass valve that goes on in place of the oil filter cover, won't clear the right exhaust pipe on an OEM exhaust system .
It's also the most expensive part, if you get the OEM kit .
If the exhaust pipe is even closer on the Staintune pipe, than a stock system the cover that you can use from a later airhead bike, may not clear either .