Would it be better to install the 3.7 intake manifold or have the stock manifold ported and polished and install the 3.7 Tb???

 

We've never had any real side by side, same day dyno comparisons between the two options, so it's tough to say for sure, but I'd guess the TL-SHAWD manifold will make a bit more power. The 7-8 lbs saved and cooler running composite are bonuses. Getting your current manifold ported would likely be cheaper, but don't forget you'll also need the P2R TB adapter to run the bigger TB on your manifold.

Also, for full benefit, you should add ported runners and a 3.5 or 4" CAI.

 

get the 3.7L manifold. its lighter, doesn't heat soak as fast either. Those 2 alone help a lot with the car. Or you can get a TL-S 3.5L im its lighter and also magnesium and use the stock TB