Phil,
From the product description, I would say my understanding of the offroad pipe is a little hazed. I was under the impression the offroad pipe was 2.5 in diameter (flange to flange).
From your correspondance with the Grand Prix store, it seems that it may be a 3.0" pipe and in that case, it will NOT be a direct bolt-on to your stock exhaust system.
From their webpage:
Two part numbers to choose from. One bolts up to the stock down pipe, the other bolts up to the down pipe of headers.
Their description would imply it would be a 2.5" diameter pipe.
The product description could be old or wrong. If the Grand Prix Store says it wont fit, then I would listen to them.
Perhaps someone who has bought the Offroad pipe can offer some advice?
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