Put me down as another fan of RX's VMax ported throttle body for our CTS 3.6 motor! The install took about 15-20 minutes in the underground parking garage of my condo and right off the bat I could feel a difference driving up the ramps at low RPMs to get out of the garage. Driving around town it's easy to notice the difference in part-throttle response and the car feels so much smoother accelerating from a stop. It also reduces that surge you feel around 4000 rpms. It's still there, but not nearly as noticeable. Power is now much smoother from a standstill right up to redline.
Overall for $150+shipping both ways (to send your core back)+15 minutes I'm definitely happy with it and would do it again in a heartbeat! My car is still a lot more 'show' than 'go' and needs more (and/or less, depending on how you look at it) but as a starting point the throttle body is well worth the money and time.
Being a fairly new car I was worried about voiding the warranty so I spoke with the service manager at the dealership and he said bolt-on parts rarely result in a warranty denial. The warranty would only be denied if an aftermarket part fails and causes other failures. He said the only exception is flashing the ECM - if you modify the computer then have a failure they may deny the warranty. Kind makes sense I suppose...
The only tools you need are a 10mm socket (w/extension) and a flat head screwdriver. Then you:
- Pop the hood, remove the oil cap, remove the engine cover, put the oil cap back on.
- Disconnect the air hose. You only really need to disconnect it at the throttle body but it's easier to disconnect it at both the throttle body and the air sensor and get it out of the way. No need to disconnect the fresh air line.
- Pull the four bolts on the stock throttle body. Watch the lower passenger side bolt because it also holds a bracket. You can just let the bracket hang because it isn't going anywhere.
- Disconnect the wiring harness and take out the existing throttle body. While the stock TB is off it's a good idea to reach in with a clean rag and clean out as much oil as you can (there will be oil in there).
- Connect the harness to the new throttle body, line up the gasket and the bracket, then bolt her on.
- Reconnect the air hose, take the oil cap off, put the engine cover back on, and screw the oil cap back on.
It really is that easy! 15 minutes start to finish, or maybe 30 tops if you have to fiddle with the bolts. My car is otherwise completely stock, and 10 years living in a condo with a 'no working on cars in the garage' rule means I haven't wrenched on a car in at least that long and probably longer. If you've never wrenched before this would be a perfect first mod because it's so easy and it's hard to screw up.
P.S. No relation to RX Performance, just a happy customer and real happy someone has finally stepped up with some bolt-ons for our cars. I've always thought the AWD CTS can hang with just about anything on the road in terms of style, but is one of the slower cars in it's class. I can't say whether this mod made the car faster overall but it does make the car feel quicker driving around town at lower RPMs. Next up is the catch can and breather kit, then a CAI and the
iceolator seems like the way to go.