mandrel bent pipes allow for a more consistent tune through out the rev range on performance engines as they stop the echo effect(back pressure rebound)when a performance engine is running hard the exhaust comes out in a pulse and if the pulse is interrupted the tune is not as effective thus making the engine not perform at its peak,but remember we are talking about top of the line 1/10 of a second performance engines not street cars.so on a street cars it only gives you something to look and brag about.On a performance engine/car it is a big difference to killing a engine or not.hope this helps
3in 90 Degree Mandrel Bent Exhaust Pipes 2x , Flowmaster 15903 Pipe Kit Tailpipe, 3.50" Mandrel Bent, Flowmaster 15902 Pipe Kit Tailpipe, 3.00" Mandrel Bent, Flowmaster 15901 Pipe Kit Tailpipe, 2.50" Mandrel Bent, 3" ALUMINUM MANDREL BEND BENT EXHAUST/DOWNPIPE/INTERCOOLER 180° U PIPING PIPE , 3" DIAMETER ALUMINUM MANDREL BEND/BENT EXHAUST/DOWNPIPE 180° U PIPING PIPE BLACK, 2.25"ALUMINUM MANDREL BEND BENT EXHAUST/DOWNPIPE/INTERCOOLER 180° U PIPING PIPE , 2.75"ALUMINUM MANDREL BEND BENT EXHAUST/DOWNPIPE/INTERCOOLER 180° U PIPING PIPE , OBX 3.00" V-Band Pipe 45 Degree Stainless mandrel bent module with V band, 2" Intercooler Mandrel Bent Universal Aluminum Piping Pipe Kit Turbo Silcone, MagnaFlow J-Bend 3in Mandrel-Bent 180 Degree Pipe 10719, Mandrel Bent Thick Stainless Steel 90°, 2.25" Pipe, Mandrel Bent Thick Stainless Steel 90°, 1.75" Pipe, Mandrel Bent Thick Stainless Steel 90°, 1.75" Pipe, Mandrel Bent Thick Stainless Steel 90°, 1.625" Pipe, Mandrel Bent Thick Stainless Steel 90°, 1.625" Pipe, Mandrel Bent Thick Stainless Steel 90°, 1.5" Pipe, Mandrel Bent Thick Stainless Steel 90°, 1.5" Pipe, Mandrel Bent Thick Stainless Steel 180°, 2.0" Pipe, Mandrel Bent Thick Stainless Steel 180°, 1.625" Pipe, Mandrel Bent Thick Stainless Steel 180°, 1.5" Pipe, Mandrel Bent Thick Stainless Steel 135°, 2.5" Pipe, Mandrel Bent Thick Stainless Steel 135°, 2.5" Pipe, Mandrel Bent Thick Stainless Steel 135°, 2.25" Pipe, Mandrel Bent Thick Stainless Steel 135°, 2.0" Pipe, Mandrel Bent Thick Stainless Steel 135°, 2.0" Pipe, Mandrel Bent Thick Stainless Steel 135°, 1.75" Pipe, Mandrel Bent Thick Stainless Steel 135°, 1.625" Pipe, Mandrel Bent Thick Stainless Steel 135°, 1.625" Pipe, Mandrel Bent Thick Stainless Steel 135°, 1.5" Pipe,