The Grand Rock 3 1/2" to 4" exhaust adapter is made of aluminized tubing. The adapter will expand your 3 1/2" exhaust pipe to a 4" exhaust pipe size with little to no effort, allowing more mass air flow. If your truck has 3 1/2" exhaust and you want to put a Grand Rock dual stack kit on it, you will need this adapter and the 3 1/2" clamp. The Grand Rock pre-formed band clamp, sold separately, provides a much better seal then other exhaust clamps.
Made in the USA
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Grand Rock Powerflow 3.5" to 4" Exhaust Pipe Adapter Fitting
Description
Details
Grand Rock has been the manufacturer building exhaust systems for diesel trucks for 30 years. The quality can be seen in the chrome plating and heard in the sound. Grand Rock Dual Stack kits add style and performance, with horsepower gains and EGT (exhaust gas temperature) cooling ability.
![Skill Level 2 Icon]()
Level 2Intermediate
Additionally Available
You will need 3 1/2" Clamp to install this adapter.- We also offer Grand Rock
- 3"-4" adapter
- 3" clamp
for converting from that size exhaust.
Installation Notes
Installation Difficulty:
Level 2IntermediateYou will need 3 1/2" Clamp to install this adapter.
Installation Time: Less than an hour
Warranty
1 Year Limited Warranty.
Fits 3 1/2" existing exhaust, converting to 4". Most late model trucks are 3 1/2" or 4" from the factory. Be sure of your size when ordering.
Grand Rock Powerflow 3.5" to 4" Exhaust Pipe Adapter Fitting Options
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