Muffler / Exhaust

[89Vette]

My Muffler was in bad shape - worse than I knew - I cant believe the difference in the performance. A new exhaust/muffler system should not make that much of a difference - but it did!

I was talking to our Isuzu guru Jerry Lemond last summer, who mentioned the strong possibility that our mufflers have a warm-up valve inside. But he couldn't confirm it...nor could this forum.

If there were one...and it were stuck, it might explain an obstruction severe enough to cause a pronounced improvement.

???