So looking at the listing, apparently there are some fitment difficulties with a 10" wide rim. I am going to be using the 15x10 UL with a 25 offset, leaning towards the 2.5" kit just because I am still running the factory plastic under tray and it will be some time before I get to making my own front diffuser/belly pan. It says the 3" will not fit, I figure a 2.5" duct is still better than no duct.

Who's got 10" wides and what size did you go with? Maybe something other than the Singular kit? How difficult was the ducting to run?

 

I run the 3" with 15x10.

The limitation comes into play if you keep the plastic undertray intact, because the side of that undertray makes a 3" hose sit too far outboard for the 15x10 to clear it at full lock. Easily avoided if you don't have the factory undertray any more in favor of better ducting which can be designed slightly narrower, or you could just trim the plastic so that the hose can "sink" into the plastic to clear the wheel.

If you have an aversion to modifying the plastic undertray, then 2.5" is the size for you, and that is certainly far better than no brake ducting. But if that were the case then 15x10's probably wouldn't be for you

IOW, guys running 15x10s are usually the types who don't shy away from a little cutting to make the 3" hose clear.

 

Ryan, you're going to be my new race mentor lol

I don't mind hacking up the tray, have to do it for the larger/relocated FMIC pipes anyway. I really want radiator ducting/front splitter but I am not skilled/patient enough to make my own and cant imagine it being cheap to do at a shop. I really need to do that before I start seriously driving at the track though

 

FWIW, even the 2.5" tubes rub on my 9" 6ULs with the undertray intact. I can't cut it any more than it already is -- already has big holes for intercooler tubing.

Just a data point.

 

Ditto, but I'm not running the factory under tray and I don't have intercooler pipes to contend with.

It's still tight and I have worn holes in a couple of duct hoses, but I have finally managed to squeeze them in there at full lock between the sway bar end link and the inside of the wheel. It took some messing around on the hoist, twisting the duct at the mounting points and squeezing it a little flatter at the pinch point.

I still avoid using that last fraction of lock when manoeuvring the car around the pits, on/off the trailer, etc to avoid contact. Haven't worn through a duct for a few months now.

 

I run the TSE 2.5" with 10's and I have stops I built to keep the rims from hitting the upper arms, but with a splitter undertray.