I'm looking for something that will give me the best performance. Was thinking about going 62mm on the throttle body but that's affect my low end torque. Any suggestion that will give me the best gain?

 

Best Performance for what? Be specific.

But without knowing a thing I'm gonna say Tires. Can't stress that enough. Tires are going to be the best mod you can make on your car. They are the one item that effects everything you do. The will help you corner better, accelerate and come to a stop, better than anything else you can do.

 

Unless you intend on upgrading to FI, larger intake manifold, high flow heads, cams or long tube headers that require more airflow.. You have very little to gain by swapping out your stock throttle body for the 62mm..

On a stock 3 valve motor, your OEM throttle body is sufficient enough as is and can handle up to 450+ HP.. Anything above the OEM 55mmTB on a stock 3v 4.6 is overkill.. Therefore If your looking for the best performance for your buck, I would recommend starting out with a cold air intake and tune first and then consider going with some of the mods I've listed and go from there..

 

It's a 4.6 it's been cammed,long tube headers,cai,rockers,and stock throttle body. And has custom made pipe

 

You didn't mention anything about that in your original post, so I had no way of knowing as to whether or not you did any kind of mods..

Now that I know what mods you've already done.. Then yes, your car will most definitely benefit by upgrading to the 62mm throttle body