Reading and believing everything you read on the internet.
Don't get me wrong in theory a mandrel bent system is better and flow rates are higher. In real world situations are mandrel bends the be all and end all then teh answer is no.
Where you have mandrel bends butt jointed to pipes this tends to create a situation worse than a crush bend. Where the joint has a slight step this sends reverse direction shock waves into the exhaust gas stream. Very few mandrel bent systems use correct lap joints that remove that problem.
There is a interesting video on youtube showing dyno tests of a exhaust manifold all nicely bent and then the results after hammering dents into it and then more dents. The dents on this engine gave better results than without! Would that happen on every engine? Certain to say no but what it does go to show is if you want to extract every last possible bit of power you need dyno time and sometimes try teh unlikely.
BTW that downpipe has been fitted on another car (customer collected teh pipe in person and shown the exessive crush) and has made some good results on the dyno. Would it be better with a better made downpipe? Who knows without back to back dyno testing.
I am much happier with the new downpipes but with a RHD car and the factory manifold the flow is never going to be ideal
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