Well, If I'm remembering this right, the 2.5 is also known as the "super duty four" which is basically half of a Pontiac V8. I would think they would be fairly stout for some improvements. I know there were some GM Performance Parts available for it a while back.
The only real common problem is that the timing gears can go out on them. But yours may have a chain.
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Cliff Scott
2004 Alero GX w/sport pkg - Sold, living somewhere in WI now.
2011 Saab 9-5 Turbo4 M6
2004 Corvette Convertible M6
1994 Chevy Beretta - Quad4/M5
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