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Hanksville Hot Rods is pleased to offer its resonated secondary cat bypass for the 955 and 957 Cayenne. The stock Porsche Cayenne has 2 sets of (4 total) catalytic converters and this bypass removes the rear set of cats (you will still have one full set remaining on the car) to increase HP/TQ, sound levels by a marginal amount and provide incremental weight savings. Similar in design to the standard secondary cat bypass, the resonated bypass differs by adding a resonator to the bypass. The resonator has a straight-through high-flow design, with a center perforated tube surrounded by packing to reduce the amplified metallic rasp that is generated from removing the stock cat.
We manufacture our own bypasses in Denver, Colorado. The tubing, flange, and 4 adjustable hangers are made from 304 stainless steel with a matte/brushed finish. We utilize a 2.5" tube which mates up to the factory down pipe, then to the factory exhaust. Our flanges are 3/8 inch 304 stainless steel, CAD-designed to match factory specs and precision water jet cut. Our bypass pipes also incorporate four unique, independently-adjustable stainless hangers for easier fitment and to allow customers to adjust their bypass clearance as the exhaust moves over time. In addition, we have realized the importance of the hangers in supporting the midsection of the exhaust. While the bypasses are considerably lighter than the factory cats, hangers are mandatory because the factory downpipes are flexible braided stainless steel and are not designed to be weight bearing. Adding bypasses without hangers will eventually damage the factory downpipes.
The factory secondary cat has tight-radius mandrel bends that are formed on our own in-house mandrel tube bender. Custom mandrel-bending reduces the number of weld seams, resulting in a nicer-appearing product with less chance of weld breakage.
Bypass pipes will provide a power increase in the low-end and mid-range power band on a CTT and most importantly allow the turbos to spool significantly quicker. This product will provide significant power peak gains after an ECU tune. It is a noticeable difference and you will feel the difference the first time you drive with them installed. On the Cayenne S, the bypass provides immediate add-on power gains throughout the power band with peak gains of 15hp to 17hp.
We believe this is a DIY project for anyone capable of operating a wrench. We provide detailed instructions, needed hardware and aluminum gaskets. This project is estimated at 90 to 120 minutes for the first-timers. It’s a 60-minute project once you’re comfortable with the process.