It's definitley worth it. If there is any air getting sucked in from the denfer well, it's being lost with the crappy KKM provided hose. I used to open the hood every day to check that it hadn't fallen out and got caught up in something. And, especially if it's on an SVT, that intake really has no support...and it does a good bit of flopping around. So even if i've only eliminated that, it was worth the $4 and change it cost for the part. Be warned, you'll have to cut the part you buy so there's no returning it. It's possible you've got air slipping through where the KKM hose meets the fenderwell and that's what's making the hiss. I can't say I haven't heard it. But, you're always going to hear a noise, the nature of the beast. It's a good idea, trust me
