I'm Not sure yet exactly! Giving you have the right header there is no need to modify the exhaust
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Ti for the sound and the amount of weight you save! No sound can compare to titanium
You'll need one when you get fined :P
I know you have your heart set on this setup mate, but in my opinion if you fit a 70RR to a street car you are asking for trouble with the fuzz and the EPA. If there is anything else not strictly 'legal' on your car such as coil overs then an exhaust like this will draw unwanted attention. Most aftermarket exhausts will be over the EPA noise limit but there is sensible (Fujitsubo) and then there is nuts! (Js 70RR) haha
I don't know if you have seen this but this video is a good comparison of various JDM exhausts on a DC5.
http://www.youtube.com/watch?v=ea6xpwciZEU
Yeah haha so do I. I will be getting the RM01a for my car. Its not as loud as the Powergetter. From what I have read in other posts the powergetter is generally considered to have a better sound and good top end power, but the Rm01a has more consistent power delivery through the rev range.