Those are knock-offs of the HKS downpipe. The criticisms of those, are that its acutally 2.5" where it meets the elbow, and they hang somewhat low so there is a problem with them scraping on lowered cars. It is not reasonable for high power goals, unless you want to get an aftermarket turbo elbow somewhere down the line. If you're just going for BPU and are on a budget, I think this would probably work fine for you, and give you a very noticeable performance increase. Getting rid of the stock exhaust and the cat are the best bang for the buck mods you can get.
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