so i got an na gtu and im looking to do a port job eventually im gonna have a full exhaust high flow cat and intake. its gonna be a street car, so id like it to stay drivable and reliable, but id like to get around 200-220 whp im also gonna use lsd, im wondering if this is achievabe with an extend port or a bridgeport and which do u think would be better for my set up?

 

200HP is achievable with a street port if all conditions are correct. This means a full exhaust (might not be possible with a high flow cat), a good non-restrictive intake (meaning a proper cold air setup) and a good tune (standalone). It is not economically feasible as you will have to dump quite a bit of money into it to get to this point. But if you are dead set on a 200 RWHP NA, then it can be done.

If all you want is 200HP, then swap in a turbo engine and raise the boost slightly from stock.

Bridgeports are a another level. NA bridgeports are very loud and this is almost unavoidable due to the open exhaust they require. Additionally you'll need to ditch the stock intake manifold and a standalone will be required.

 

what kinds of intake manifolds are available?

 

Besides those designed for carbs, I don't know of any aftermarket intake manifolds. Aaron was referring to one-off custom built manifolds.

 

There are only a few manifolds available for EFI 13Bs. TweakIt has a nice set of ITBs, and then there are various combinations pieced together out of manifolds designed for carbs that have been adapted for EFI. None of these are really daily driver friendly.

Using the TII upper and lower is a low-cost alternative for massive NA port jobs when the NA manifold's tuning is broken by changes in port timing.

Realistically, NA bridgeports just aren't good street cars. A good tune makes them drive very well, but to make use of the ports, the exhaust ends up very loud. They do have a small lack of low end and really only pick up above 4K. Turbo bridgeports are a totally different story.