Fabspeed Porsche 996 Turbo Sport Headers (2000-2005) Accessories & Apparel Porsche Cayman GT4 Fabspeed Xpertune

Porsche Cayman GT4 Fabspeed Xpertune Tuner with GT450

HJS German EMITEC 200CPSI catalytic converters can flow up to 90-93% of a straight pipe in most applications

The only issue that could possibly arise is the need for a new MAF sensor if you already have a degraded sensor or perform a TB adaptation

but if you're looking for a very aggressive exhaust note and you're not worried about waking up the neighbors

Fabspeed Porsche 996 Turbo Sport Headers (2000-2005) Accessories & Apparel Porsche Cayman GT4 Fabspeed XpertuneFEATURES: Fits all Porsche 996 Turbo Turbo S vehicles (2000 2005) Increases horsepower and torque by 12 whp and 14 ft lbs Saves 3 lbs from the rear of the vehicle Equal length one piece CNC mandrel bent primary tubes provide maximum uninterrupted flow Features 3 into 1 high velocity merge collector Constructed from high quality 14 16 gauge T304L stainless steel for optimum flow and maximum durability Direct replacement for factory headers Optimized