I just got mine last week from Frank Supply in Texas for $620 plus $50 shipping. That was the best I found. Great exhaust! True muscle car sound and idle with no dreaded drone!
I got mine from LM Performance last year ... couldn't be happier with their customer service, etc.
I'll be ordering from them myself in a few weeks... I plan to have the Corsa's sitting in the garage waiting for the day I bring home my GT. (March 15th if things go smoothly)
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