ATR is one of the best exhaust systems on the market. They are as close to an open exhaust that you can get using a muffler. I had their system on a 95 Impala. I did have some drone around 1500-2000 rpm's on the Impala. I think the reason the pipe starts at 2 1/4" as all catback systems do is, that is the stock pipe size after the cat. The only way around that would be to go to an 2 1/2 of 3" cat. Their system is pricey but were well made. 2 1/2" - $500, 3" - $600.
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Don
2003 PT GT
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