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Originally Posted by Heath88Caprice
I've seen that before, it doesn't tell you how large the exhaust inlet/outlet are, it just tells you how to install the muffler. But I had another question. What do you think of the Autolite XPs I put those into my Buick to replace the old Delcos. I figure that since it's O.E. style it should have the same heat range and use less power and create a bigger spark. So as always help is always appreciated.
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You will find quite a few GM professionals on this site and I beleive they will all agree that AC Delco parts are best for all GM motors,the proof is in their experience.