I’m done with the install of the DDM Rotrex supercharger kit and I now have 200+ miles on it so I feel like I can write up a review.
I ordered this kit during the Black Friday deal last fall, took about 5 weeks to receive it which I thought was good given holidays. Then it sat in my basement to wait out the long cold MN winter. Occasionally (really multiple times per day, my wife will attest to that) I would go down there and check on it, go through parts again, make sure it’s all still there, just waiting for warmer weather.
I gave in the first week of Feb and bought a garage heater....yay!!! Time for the install!
the install took me several weeks of a couple hours here and there...doing a step or two each time I had a chance to work on it. I have twin toddlers and my wife is a tax accountant so I was working, being full time dad and trying to squeeze this in at the same time. The girls did help with tie wrapping some of the wires 
. If I worked on it solid, I’d imagine a day and a half would be very doable for me. Only help I had was to remove the hood.
The instructions were really clear, I did contact Dave@DDMWorks a few times via text and once over the phone to clarify a few things, every time getting a quick response that answered all my questions. The kit is really well made, designed and the fitment of all parts was great. I am probably average mechanical skills, maybe below average, and I was able to do it pretty easily. Just took my time. I did have to buy a few tools like a larger socket for the crank bolt, some shears to cut away the rear radiator shroud, grabbed tool and endoscope to retrieve a lost bolt in the bell housing (stupid mistake!) and modified an Allen key to get one of the bolts in that attaches the supercharger support to the front of the engine. I did not remove the radiator, would have been easier if I did that.
Finally got it all together, worked up the courage to fire it up and took it for a first drive...it ran flawlessly!! It was really hard to keep the RPMs down for the first 65 miles of break in, which I finished the break in the next day. Once broke in I could let it rip...and this thing is wicked fast! Massive improvement over stock. I have had one quick car in my life (1995 Eclipse GS-T) but nothing like this, this is really my first true performance vehicle and it is so damn fun! I loved my slingshot since I test drove it back in fall 2016 and I love it even more now. The power is so smooth and pulls like a freight train. The blow off valve is addicting. I have the welter 2.5in exhaust as well and it sounds awesome across the entire RPM range. I smile and giggle like a kid every time I press the red button....heck I do it when I see it in the garage every morning!
For anyone else thinking about adding a supercharger, you should do it! If you do, go with DDM, they make great products and stand behind them. I also have the DDM surge tank, fuel rail, sway bar, mounts and end links...maybe more I’m not remembering, they are all great products.
Here are a few photos. I’m done with all the mods I want too do now...said no slingshot owner ever...time for wheel and tire upgrades!!
