Hi, i am thinking of getting the Helix Uppipe, Downpipe and Greddy Evo 2 catback. I heard on a different website that the Greddy Evo 2 does not bolt on to an aftermarket downpipe, only the stock one. Is this true? I thought that the Downpipe had the same opening and closing as the stock piping because you could use the stock gaskets? If you guys could help that would be great.
I think it works if you buy an adapter for it. It is made to fit a 2.5" and that why it is able to mate to the stock DP with no problems. Most after market DP's such as the HELIX are 3". Hope this helps.