I appreciate your two cents, but lets hypithetically say that this guy is no Hick and does really great work. He has a mandrel bender and is a master welder. Then would you consider it?
Some other points I was thinking about are:
I really challenge the statement that (not all but some) these exhaust companies do any true scientific research. I'm willing to bet that all the aftermarket companies that make exhaust for the WRX did not pour millions in to R&D. This companies just don't have that much cash.
Case and Point 1:
If Subaru spent so much time on R&D then why is it so restrictive? And don't say because of emissions, they could have taken that into account and still had a high output exhaust that meet emission standards.
Case and Point 2:
Turbo Magazine compared 12 different cat-backs systems(Seen here)
. The most expensive system (M2) has the lowest HP/TQ in all categories. What kind of research did they do? I would think that if everyone did R&D they would be coming up with a much more similar results.
Case and point 3:
Many, many people are extremely happy with the quality and performance of the absolutely cheapest uppipe/downpipe there is (HKS). What make the $285 M2 uppipe any better than the $152 HKS?
Case and point 4:
A 20 degree mandrel bend wouldn't be any more or less restrictive than a 19 or 21 degree bend and the placement of the bend give or take an inch or two should not matter either.
Case and point 5:
Whats the worst that could happen? I don't get peak HP? So, I lose maybe 5 HP. It's worth it to me if I can get it for $500-$700 cheaper.
These are my thoughts and I'm might be wrong on all of these points. Please, by all means prove me wrong.