Quote:
Originally posted by 302 LX Eric
If you just start it up and let it run a little while, you will get condensation build-up in the exhaust pipes for sure. Without stainless steel, you'll get a nice breeding ground for rust. The trick is to blow it out by revving the motor or taking it for a good 20 min drive so that the condensation build-up burns off the pipes.
Good catch, Getto. 
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Thanks Bevis. I keep my 72 Challenger garaged all winter, and whenever I start it up, somtimes every 1-3 months (salty roads in NYC), I take a drive after its nice and warm. I don't start it up unless I am going to take it for a spin. I was not 100% sure if this was necessary, but it sounded like good advise and after 4 years of doing this the Mopar is still running hard!