IRP vs Coolerworx Comparison

trangalang

Wanted to post a little review of the new IRP short shifter. Previously was only available for the 350z but it looks like IRP recently decided to make a mounting plate for the 370z. Purchased from DriftHQ on Black Friday.

Chassis mounted, similar in design to the Coolerworx. A few members on here have complained about the rattling from the Coolerworx and the difficulty when it comes to finding the source. I didn't have too much rattling - only at high RPM's and seemed to be intermittent. Was pretty content with it all things considered, but I believe the source of rattling on my unit was at the very bottom - the piece that connects to the linkage. Coolerworx has a little bit of play while the IRP feels solid.

• Price - Pretty close depending on where you buy it. Will be somewhere around $450-$500
• Build Quality - Similar compared to the Coolerworx. No complaints here.
• Ease of Install- Same as the Coolerworx. IRP does include longer screws to mount the base plate to your chassis (highly recommended, or risk stripping out the threads on your chassis).
• Reverse Lockout - Coolerworx has a collar, while the IRP has a button. Engagement on both feels smooth.
• Height - IRP is slightly taller and the fulcrum point is slightly lower. I would think that this would result in a slightly shorter throw but I can't tell the difference between the two. I was running a slightly taller shift knob on the Coolerworx which made the height on the two pretty much identical.
• Feel/throw - Both units felt the same in terms of reduction of throw from OEM.
• NVH - Coolerworx had an intermittent distinct rattle at high RPM's for me, while the IRP does not. There is a slight buzzing at high RPM's on the IRP due to vibration but is significantly softer compared to the Coolerworx. Driving at normal speeds (under 3k RPM), both did not rattle. Currently running a Z1 poly transmission mount.

Pros/cons/personal preference

• Reverse lockout - Coolerworx utilizes a collar, IRP uses a button that sits at the top of the shifter. I prefer the button over the collar.
• You can change out the shift knob on the Coolerworx. Although, thread size is M12 x 1.5 compared to the OEM M10 x 1.25. I ran a Likewise shift knob with an adapter.
• IRP is a bit cleaner IMO. The reverse lockout cable is fed through the cutout of the shifter so it is better hidden. The lockout cable of the Coolerworx runs from the collar and sits alongside the shaft of the shifter. This never really bothered me, until I read somewhere on a FB group pointing this out. It's bothered me ever since.

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