Quote:
Originally Posted by Rodsrsr
1 3/4" is way too large for a 3ltr or even a 3.2. The correct size is 1 5/8" and anything larger like Kach says, you will lose tons of low and mid range hp and torque. You need at least a 3.6 to run those large headers, so if the new headers are the larger size this is undoubtedly the problem.
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And there you go.
Frankly, 1.5" headers are the right size for a stock SC engine like yours. We get 255+ BHP from such engines using 1.5" ones so I'd be using George's Headers for your application.
Lastly, mufflers make a noticeable difference and I can tell you without reservations that they are NOT all the same, performance-wise. Choose wisely here, otherwise you wind up with less power than stock.