Perfect fit and easy install. Didn’t really notice a difference

Easy install, dropped right in. Took maybe 20 mins to install. Took about a day but the change in idle smoothness is very noticeable.

Installation was a breeze. 20 minutes and 2 wrenches. Did quiet down a little.

Product was high quality, fit perfectly, and arrived ahead of estimated date. However, the product did not change a thing on the engine as product was claimed to do. Waste of money.

No fuss ordering/delivery to Australia as with all my parts from Riff Raff.
Quality is excellent and fitting was easy.
Idle quality and noise reduction has improved.
Great product and service Riff Raff.

Great fit and high quality. Over tightened fitting into head with O-ring first time - had to replace o-rings - no problem since.

Fitment was great no leaks

This should be everyone's first mod, the truck idles much better and it took me about 20 minutes to install.

Just installed this on my 2001 super duty and noticed the idle got a bit more consistent, no more up and down while idling. The throttle response from a stop got a bit better. Before with my PHP chip on the 80 DD on a normal acceleration I noticed the truck would hesitate for a second then start accelerating normally. Haven't noticed it since I installed this.

Installation took me about 45mins. I removed the intake manifold then the intake tube to get it in there. Probably could of gotten it in without taking all that out but I was also installing the crankcase vent kit.