No performance enhancements for the Northstar, Corsa makes an exhaust for 2000+ Seville, not sure about the DTS and if one will gain a performance increase though
Corsa makes an exhaust for the '98+ Seville. They recently discontinued the '00+ Deville system.
Exhaust mods on these cars are for your listening pleasure only, the stock exhaust is not particularly restrictive. With a full cat back system, you might see a few HP at redline, at WOT. Mufflers alone would gain you nothing at all.
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