Join Date: Dec 2016
Location: Cleveland Heights OH in summer, Tucson AZ in Winter
A vote for supercharger
This is an unabashed endorsement of the DDM Supercharger. I have two on 2.4L NA Solstices with automatic transmissions. The first was installed by me and a friend, then dyno tuned by ESTunes. The second one was installed by Dave from DDM at NASSAM2019. Both have immediate low-end torque, no turbo lag, and are a big improvement over stock NA. Disclaimer, I have not driven an RL or a GXP.
The first installation dynoed peak torque at 3300 rpm, then a rapid falloff, limiting hp to 238. We suspect exhaust restriction and will install a high flow cat. Still, it runs the quarter in 14.2, splitting two races with a friend's GXP with GMPP. Both times my car was ahead at the 1/8 and he caught me by the 1/4. 0 - 60 is 5.98.
I have not dynoed, tuned or raced the second car, but it feels about the same.
Winter Solstice, Tucson AZ - '09 NA Automatic Cool Silver Coupe; DDM Supercharger, MagnaFlow cat and exhaust, ESTuned; GXP sway bars, DDM chassis kit; Stoptech brakes; Michelin PSS tires; Pioneer radio w/ NAV and b/u camera. Plate SOL N AZ
Summer Solstice, Cleveland Heights OH - '09 NA Auto Mysterious Black Coupe; DDM Supercharger, MagnaFlow, DDM chassis kit, Hawk brake pads, Conti EC Sport tires on Black ASA wheels, Advent radio w/ NAV and b/u camera. Plate SOL 4 OH