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I have an 01 with the Performance/Handling package...it was way too quiet with the stock mufflers. I put Thrush 17704 Turbos on it and it came out great. Nice a mellow when idling but it snarls when wound out.
. I changed my 04 Grand Marquis with a borla cat back system and it runs and sounds great. The cost was up there about $1000.00 bucks but it is Stainless steel with lifetime warranty.
still have this car today. Did the change some years ago but still runs strong with 70,000 miles on her .
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I watched and listened to a bunch of YouTube videos before making the decision to use Thrush 17704 Turbos. I am the second owner of a 01 GM GS with the Performance/Handling suspension with the factory duels, with 84K miles. I wanted less restriction and just a bit of rumble and the Thrush units ended up being perfect. Nice and mellow at start up and idle but rattle a bit when I get on it. The guy that ordered it specified the 3.55 open rear end with no traction control or anti lock brakes. I threw a K&N air filter on it for a few extra ponies along with a bit more induction noise.
