Join Date: Jun 2007
Location: Coon Rapids, MN
The K&N for the 2.4 is almost identical to the one for the 2.2. The gains will not be that much more drastic. I would say closer to the 6hp gain.
I don't have experience with either the K&N or the GMPP, but I wouldn't get GMPP unless your main goal is to keep your warranty intact for sure. I would get the K&N out of those two. I have an Injen. I used it in the SRI (Short Ram Intake) position for a couple weeks. It had decent power and was nice and loud. A little better throttle response from a stop. Then I switched it to CAI (cold air intake) and it's got better response up top and doesn't seem to be as loud. I don't know if that's because it's farther away from the cabin now or if it really isn't as loud. I really like the Injen a lot and even though I have only had it for a couple months, I recommend it.
There are also AEM and Fujita who make intakes (not totally sure if they are for the 2.4 as well as the 2.2, but most intakes made for one are going to work for the other).
The larger displacement will probably show a little better gains for each mod when you compare them mod to mod...say a 2.2 and a 2.4 both have the same intake, header, dp, exhaust. I'm sure the 2.4 will gain a little more power than the 2.2.
It's really up to what you want to try and how much you want to spend.
|07' LS Sedan|Ultra Silver|Auto|MTX X Thunderlink|Debadged|35% Tint|Sportlines|Injen CAI|ARK Antenna|ARK STB| OTTP "Street" bar|Bridgestone Potenza RE960AS Pole Position 205-60-15|Hawk PC pads|PowerSlot Slotted rotors|
Not installed yet: Pacesetter Header|Exhaust Depot DP|LSJ Cat-Back|Injen Hydroshield|MSR 045 18x8 Black w/ Red Pinstripe