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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! |
