5" down pipe, yes that is right 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 mid 9 second cars. This wastgate configuration will outflow most aftermarket external waste gates.

We are working on a complete down pipe. Available today we have this down pipe kit that will include all of the exotic parts needed to construct a complete version. Most of RJC customers buy this kit, bolt it on and take it to their local muffler shop to complete the install. Because of the aftermarket diesel performance, mandrel bent reducers and pipe are readily available in sizes up to 6". pluming this in is a snap for them. You can easily be into one of these for cheaper than buying a 3.5" down pipe. This thing is so huge a pop can will actually fit inside it sideways!!

Massive 5" DP        $449 flange/elbow 304 stainless flange

The 5" down pipe kit comes with: Weld flange, Elbow, Wastegate flange with integral waste gate puck, and V-Band. Basically everything you see in the above left picture. The elbow pipe is mild steel all waste gate parts, flanges and the V-Band are STAINLESS steel.

These are examples of down pipes; (all these down pipes can be installed with the crossover connected and retaining the A/C box)
1: Standard 3" Houston down pipe.
2: 3.5" Houston Down pipe.
3: RJC 5" to 3.5" Down pipe.
4: RJC 5" to 4" Down pipe.

RJC Super high Quality 100% American made perfect fit 3" 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! 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 will include a matching 3" dump pipe with block off cap, grade 8 bolts with wing nuts and lock washers, Stainless Steel lap joint style band clamp and Stainless Steel hex head cap bolts and hex wrench.. If quality is important to you then you will be very impressed with this pipe. The craftsmenship is simply awesome. Please look closely at the detailed pictures below.
Note: Dump pipe included in the kit is for Off Road Use Only.
 .