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I just ordered a set of high flow cats from Formula Dynamics to replace the main cats on my 04 Spyder. I want to remove the packing on the pre-cats (the ones integrated with the OEM headers) in order to preempt a meltdown as many have reported the car is prone to this. I have already had my "slowdown" indicator come on once at high speed indicating pre-cat overheating.

Jeff feels that installing these plus removing the packing from the pre cats should yield about 20 HP and be much less restrictive. Combined with the Larini X Pipe and my Tubi's, I am confident that the car will be significantly more aggressive.

Has anyone removed the packing from their pre-cats? If so, did any issues crop up with the downstream O2 sensor falsing. My mecahnic thinks that this coud be an issue. If it indeed does cause a falsing problem, Jeff suggests drilling a new bung hole downstream of the main high flow cats, getting longer wires and then reinstalling the sensor. Anyone tried this?

Thanks
 

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Changing subject... how does your car sound with the hi-flow cats? Does it sound like a camaro, like some people say?
 

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Hp Cats

High Flow Cats do not sound bad, they flow better and in fact they sound great... it is louder though and not for everyone.

We offer (2) versions: Hi Flow Cats and Race Cats, the main difference being the volume levels / Flow / Construction. Both flow quite a bit better than stock. Flash will be getting the HP Cats to keep the volume lower.

Removing your cats does not sound very good and is not a good idea for emissions reasons. There are certain other exhaust products and combinations that do not sound well at all. Your Maserati can sound like a Camaro if you install the wrong products. Do your homework.

We're running HP Cats, X-Pipe and Larinis. The car runs and sounds amazing. The exhaust combination with the Power ECM / DBW completely transforms the car with respect to acceleration.
 
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