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Dynometer-Proven results!
"True Dual" Exhaust kit - takes your current 2-into-one exhaust and upgrades it to the 1987-and-up "True Dual" exhaust
 The Problem: Although the 1985-86 Porsche® 928 starts out with dual exhaust at the catalytic converters, it joins into a single, restrictive intermediate muffler about half-way back. Right after that muffler, the two pipes are flattened by about a third to allow them to squeeze by the transaxle brace. Then the whole thing exits behind the LR tire after passing through yet another single muffler.
The Porsche® Solution: By 1987, Porsche® had corrected these problems by separating the single intermediate muffler into two dual mufflers, and exiting the exhaust system out beneath the rear bumper near the license plate. BUT NOW - you can upgrade to this improved system too, and without changing the rear bodywork. Our dual exhaust system exits behind the tire just like it does now!
Emissions Compliant: Does not modify or replace your catalytic converters. Emissions compliant in all 50 States.
Better Design, Better Results: New muffler technology reduces back-pressure without making a muffler so loud you cannot enjoy long trips anymore. Our Porsche® 928 stainless-steel hi-performance mufflers have a deep, muscle-car sound that you will enjoy - and still let you listen to the stereo when you want to. Every pipe is made from high-quality stainless tubing and professionally welded for us by exhaust specialists in Canada .
Audio File Available: Want to hear what it sounds like before purchasing?
"Download Audio+Video of this Exhaust System Click Here
Some Modifications Required: To install this kit, you will have to add two muffler hanger straps that you do not have currently on your '85-'86 928. They are provided. This requires that you drill two small holes in the transaxle cross-brace - in the same spot that Porsche® does for the 1987-95 exhaust. Our instructions will show you where. General mechanical skills required.
The Complete "True-Dual Exhaust Kit Includes:
- SS Dual Exhaust Pipe Set with Hi-Flow Mufflers
- SS Rear Muffler ByPass with behind-the-tire exit for the '85, '86
- 2 custom strap hangers with hardware
- 1 custom aluminum heat shield w/ 3 Stainless Steel clamps,
- 2 used Porsche® exhaust donut gaskets and clamps
- all new hardware
- installation instructions
Dyno-proven Results: See the before-and-after Dyno chart below. On this '85 Automatic, we gained 28 HP and 35 foot-pounds of Torque at the rear wheel! |
