Look into Megan Racing if you're worrying about spending too much money. Helix is going down the crapper, fast. Gruppe-s is always sold out of helix stuff anyways. I know for a FACT that Megan Racing is quality stuff. I think the DP is like 150. Check out boostbuddy dot com. But, MR doesn't have a cat. Any catted DP is going to cost you around 1-200 more dollars.