Please inquire about availability
Porsche Boost Knob – Adjustable Control for Porsche 917, 924, 930, 934, 935 and 962.
This is a painstakingly accurate replica of a Porsche Adjustable Boost Knob. Porsche actually patented the wastegate (exhaust bypass valve) after a visit to AirResearch in 1971 having figured out a way to improve on the diaphragm valve AirResearch started working with. In some of the photos is an image from that patent--and this valve is #20 in the diagram.
Every aspect of these parts conforms to DIN standards where possible.
The part is hard anodized which gives a nice and durable finish and closely matches the original part. All fasteners are stainless steel except for the M5 jet nut which locks down the nylon-tipped set screw that sets the wheel feel.
The regulator comes with M12x1.50 timeserts.
The machined components are made in America of 7075 and AISI 303 because the Aluminium material quality is superior to 6061. The parts were tumbled after machining to produce a uniform finish before anodizing and the stainless adjuster screws were passivated per ASTM A380.
Tools required to disassemble/mount/adjust:
All returns and exchanges are subject to a 20% restocking fee. No return will be accepted after 14 days from the date of shipment. Return shipping charges must be prepaid. Returned merchandise must be labeled with the part number in the original packaging and be in perfect resalable and non-used condition within 14 days from the date of shipment. Parts returned due to customer error will be subject to a restocking fee.
Custom, special order items, damaged, modified, clearance, used or discontinued parts are not returnable. Please be aware that we will cover the shipping cost for damaged or missing parts by ground shipping one time.
Retro Sport products are sold for off-road use only. All performance modifications and installations are at the customers own risk. We hold no responsibility either implied or otherwise for mechanical, electrical or other failure when using any aftermarket performance products. Items sold for off-road use only are illegal in some states and provinces and are intended for racing vehicles which may never be used on a public road.
Please note that shipping charges do not include taxes or duty. The customer is solely responsible for any customs, duties, foreign taxes or other fees that their country may impose to take delivery of their order. Any abandoned packages are the responsibility of the customer. In order to comply with export regulations, we are required by U.S. law to declare the exact value of all items ordered and to mark them as dutiable "merchandise." Declaring less than the true value is both a violation of U.S. law and the laws of most other countries. In addition, we could lose the right to export to your country should it ever be discovered that we were misrepresenting the value. Because we are a retailer, we are prohibited by law from marking your order as "gift," even if the order is intended as a gift by its recipient. Call your local customs office for details about these charges.
If you have any questions about any parts or would like to request a part we don't currently have, please use the form below to contact us.
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Prefer the phone? Call us at 1-510-907-9700.