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Muffler Bypass Zork Tube
Fabspeed's Muffler Bypass Zork Tube for the Porsche 911 Turbo 930 (1976-1989) is based on Porsche Motorsport's own 934 IMSA racecar design, bolting directly to the turbocharger and exiting under the rear bumper for a huge reduction in turbo lag. Fabspeed's testing showed gains of 46whp and 65 ft-lbs of torque, and the whole unit weighs under 5 lbs thanks to its 3-inch (76mm) 14-16 gauge mandrel-bent T304 stainless steel construction with an integrated angle-cut outlet. It's a dedicated competition race system, loud and light by design, so Fabspeed's sound solutions warranty doesn't apply.
Frequently asked
Does the Muffler Bypass Zork Tube fit my 911 Turbo (930)?
This listing is specific to the Porsche 911 Turbo (930). Exact fitment for your year, trim and options is confirmed on your free consult before anything is ordered.
What does the price include?
The delivered price includes the part from Fabspeed USA, freight to Australia, import costs and GST. Enter your postcode to refine delivery; the final figure is confirmed on consult.
How long until it arrives?
Every Fabspeed part is made in-house at Fabspeed USA with about a one-week production lead time, then allow another 3-4 days for delivery to Australia via UPS. That freight is already included in the price.
How much power does this add?
Fabspeed's testing showed gains of 46whp and 65 ft-lbs of torque.
What is this based on?
Porsche Motorsport's own factory Zork Tube design from the 934 IMSA racecar of the 1970s.
Is this suitable for street use?
It's a dedicated competition race system, very loud and lightweight by design, so it's aimed at track and race use rather than street driving.
How much does it weigh?
Under 5 lbs.
Who installs it?
Rennen Motorsport in Adelaide, or an authorised dealer near you. Fitting it yourself may also be an option depending on the part, so raise it on your consult; professional installation is quoted separately.
Is it covered by warranty?
Fabspeed products carry the manufacturer's warranty, supported locally through Rennen Plus as the Australian principal. See our returns policy.
Can I just buy this outright, or do I need to talk to someone first?
Every enquiry, whether it's one part or a full build, starts with a free consult. We confirm the exact spec for your car before anything is quoted or ordered.
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