RJC Racing Downpipes

The 5″ DP and our 3″ are now available with the huge 1 5/8″ puck to control the new Precision CEA Gen 2 billet wheel turbos and that both pipes come with band clamps for an easy install.

5″ Downpipe

RJC Racing 5 inch Downpipe



5″ downpipe, Not a misprint! we have developed a 5″ down pipe for the turbo Buicks that will fit with A/C. Nothing on the market even comes close to the performance of this massive work of art. This has an integrated waste gate just like the stock actuator only it is capable of controlling boost in high 8 second cars. This wastgate configuration will outflow most aftermarket external waste gates.

This all new pipe is different than the pipe we offered in the past. Redesigned to fit better and have less clearance issues. Yes it does come close to the inner fender well. Please call us for more details on this complete kit with flange with internal waste gate, down pipe and test pipe.

Massive 5 to 4 Inch Downpipe | Price; $749!

RJC Racing 5 inch Downpipe Install

RJC Racing 5 inch Downpipe Install


Note: Our 100% billet USA made Wastegate flanges (made here at RJC Racing) is an industry exclusive. no other Buick parts Distributor offers this. CNC machined from a solid billet piece of stainless steel. Quality is second to none. you wont be disappointed. Both our 3 and 5″ down pipe flanges are stainless.

3 Inch Downpipes

Utilizing 304 Stainless Steel 3″ OD mandrel bent tubing. This pipe has been specifically designed for use on 1986-1987 Buick V6 Turbo engines, when running Stock OEM, aftermarket Poston, Houston or T/A headers. This downpipe is currently the only downpipe on the market that was specifically designed to clear and match perfectly turbos that are equipped with the GTQ turbine wheel. Previous downpipes in the past have a lip that hangs over into the exhaust stream and causes extreme turbulence and back pressure issues, which would require the end user to grind and port the flange when running a GTQ equipped turbocharger. Not anymore!

3 Inch Downpipe

Our downpipe was designed to be the highest flowing 3″ downpipe on the market, with very close attention to detail in fitment and quality. The pipe kit is available with a matching 3″ dump pipe with block off cap, or 3″ test pipe (just a straight though pipe with no cut out). If quality is important to you then you will be very impressed with this pipe.

3 inch Dump PipesThe craftsmenship is simply awesome.
Please look closely at these
detailed pictures on the left.

100% American made 3 inch Downpipes
Note: Dump and test pipes included in the kit is for Off Road Use Only
3″ Down Pipe with giant 1 5/8″ puck, pipe only $599
3″ Down Pipe with giant 1 5/8″ puck, with test pipe $649
3″Down Pipe with giant 1 5/8″ puck, with dump pipe $679

Just the 3″ test pipe sold seperately $119
Just the 3″ dump pipe sold seperately $159
Just the 4″ test pipe sold seperately $129

Return Policy

This warranty does not cover any failure due to abuse, accident, or neglect. The liability of the manufacturer shall not exceed the original purchase price of the unit. Read More..