I'm new to the RS performance mods, I'm building a FRS replica here in the USA (nzwinrz on Focal Jet) and I'm want to make a good choice on the headers and exhaust system for it. I looking at buying from one of these brand names..BLUE FLAME, MONGOOSE or MILLTEK. What are the opinions of those that have experience from these, quality, performance and durability.
As well as who would be a great source, price and service.

Thanks ahead for any info

Regards
Glenn