Upgrading the TB is one of the popular mods that any Cobra owner will think of. For a naturally aspirated Cobra, if you free up your back pressure by installing headers, hi-flow cats, and cat-back, added flow of air thru the larger TB will actually benefit the car's capability to burn more fuel. As for my car, I went with the S-Trim Setup before I did anything to the car, hence my viewpoint may not be applicable, if you don't have a forced induction setup on your Cobra.
Here are some stuff that I noticed about the 65mm Throttle Body:
- The cost of TB, depending on the brand, runs you about $200. If your Cobra is N/A, and have done exhaust mods already, then it is a Thumbs Up decision to change your TB. If you haven't done your exhaust mods, I'ld suggest that you wait on this one.
- For forced induction setup, in my case, S-Trim setup, the bang for the buck from switching TB may not be worthwhile. According to the dyno test, the switch netted about 6 rwhp. I was told that this switch would probably net about 5-7rwhp, and it surely did come in the range. Should I have gone with the 70mm? Well, this question is still in my mind, however, my car will probably not see another TB change unless some major engine mod is performed.
