BOB'S MUFFLER MANDREL DYNO RESULTS
Compression bending or pressure bending vs Mandrel bending
Give us a call or stop by and check out our extensive list of dyno
result.  Also check out our mandrel myths page.  Remember, a Bob's
 Muffler mandrel bent system will give you the most power possible.

1999 GMC 1500 5.3 club cab
Blue-3" Mandrel bent pipes with 3 chamber Flowmaster
Red-3" Press bent pipes with 3 chamber Flowmaster      

Primeda Tech Center
21/2 Press Bent Tubing with straight-through muffler
21/2 Mandrel Bent Tubing with straight-through muffler