Mate I have a 2 3/4 Mandrel bent on my zd30 best thing I ever did, 16hp up overall, max torque achieved 1400 revs lower and increased by over 20%, For my money it's worth every cent, hope those numbers are what your looking for.Does the performance of a mandrel bent exhaust system outweigh the cheaper versions?
Can anyone supply figures?cheersNightjar
Mandrel bent makes the wall thickness thinner, due to haveing to strech further.Mandrel bent systems maintain the diameter of the pipe and wall thickness through the bend. A press bent system squeezes the pipe in the bend about 1/3 of the original diameter.
This bend not only restricts flow but also leads to deteriation of the pipe much more quickly as the wall of the pipe becomes thinner and the area at the start of the press is prone to higher corrosion.
Mandrel bent all the way. Stainless if you do a lot of water work (boat, water crossings, snow) good quality mild steel for most other applications.
I'm kinda with ya truckster, I do have a mendrel system but it's just because i could.I'd say on a high performance car yes mandral would be the go.
but on a ****ty 3ton diesel pumping out a whopping 100kw it wouldnt make **** difference.
Mine didn't overboost to the point of limp, but they can, mine just spooled up very quickly giving me a bit to much boost at low revs (not always good), adjusted VNT stop to suit.Once the exhaust is fitted do you have to make any adjustments to stop it over/under boosting or any thing else??