Your opinions????
By the way this is my sons membership but i think well both share it from now on.
Renntech also has a stage 6 which includes SLR-type intercoolers. I've seen these installed on an SL55 and they looked business. The jump from stage 5 to 6 is very expensive but if you want maximum power it doesn't come cheap.
MKB looks to have a really nice program too, but doesn't seem to be common here in the USA at least at this point in time. Evosport is very reasonably priced but probably won't is unlikely to get you near 600HP.
My car has Renntech stage 5 and I did get basically get the power levels promised on my post-mod dyno. Dyno showed about 480rwhp, 540rwtq. The car is insanely fast, and very hard to launch because of all the torque at low rpms. It wasn't cheap but am very pleased with the results, and the shop which did the install -- DynoComp -- was exceptional.
Renntech also has a great lowering module, and it is among the cheapest too.


