MBRP Exhaust

Once a new air intake system was installed, the next obvious

step was to improve the air flow as it exits the engine. The

system I installed is from MBRP. It consists of a 3½" downpipe

from the turbo; 4" exhaust tubing; straight, flow-through

muffler; and a 5" tip. All parts of the system are 304 stainless

steel. This blend of stainless steel is extremely resistant to

corrosion. For this reason the entire exhaust system carries a

lifetime warranty from the manufacturer.



The stock exhaust system has many drawbacks. The first and

most obvious being the sheer diameter of the tubing itself. The

stock downpipe is 3" in diameter. It is also longer than the new one.

This means a greater distance of the stock exhaust was 3" in

diameter. As opposed to the new system, which starts it's 4"

diameter size sooner along the path, creating better exhaust

flow. Here is the stock downpipe compared to the MBRP 3½"

downpipe. The stock exhaust tubing is 3½" in diamter compared to

the 4" diameter MBRP tubing. The stock muffler appears to be

anything but free-flowing. The new muffler, however, is a

straight-through design allowing exhaust gasses to flow much

easier. Another "feature" of the stock exhaust system is this

flattened part of the tailpipe, which I assume the factory does to

give added clearance near the spare tire. Needless to say, this

does not assist exhaust gasses! The tip is mainly an asthetic piece,

although, different sized tips can alter the tone of the exhaust

sound slightly. The MBRP 5" tip clamps to the tailpipe with a

single bolt and nut, which is welded onto the tip, for a clean

appearance.



Finally, when I slid the tip on to the tailpipe, I felt the tip stuck out

too far. I wanted the tip to sit under the truck much more and be

slightly more stealth in appearance. By trimming the tailpipe I got

the tip to sit right where I wanted it. Because the tailpipe had a

slight bend at the very end, trimming the end off made the tip point

more to the rear of the truck, as opposed to the side.



The end results have been incredible. There is a huge increase in

low-end torque. Acceleration from a stop is much quicker. The

exhaust tone is much deeper and louder, but it is not

overwhelming. Total installation time was about 3-4 hours.



UPDATE - 10 - 29 - 04

After the installation of the suspension lift, the rear-most

tailpipe section was making contact with the rear leaf spring.

The MBRP exhaust kit I bought originally, came with all the

necessary pieces for either a long bed or a short bed truck.

Because my truck is a short bed, I had an extra 34" long piece of

tailpipe. The solution to the clearance issue was to use this piece

in place of the "axle hump" piece. Then, to form an exit piece, I

simply cut an appropriate shape from the "axle hump" piece of

tailpipe. The exhaust now has a much straighter and less

restrictive route to follow.