The 2.5" manifold is an upgrade but not as good as a split manifold like Langdons http://stoveboltengineco.com/index.php/c...product=1395980

Or some headers will boost up the power.

But for a blow through turbo a 2.5" stock type manifold will be the easyist & a low dollar manifold to bolt on.

You will see an increase in power, but it will not be a day & night difference in just a intake & carb swap on a stock engine.

You would need to install a 2.5" ex. manifold, run 2.5" exhaust system & a cam swap to see a good difference in power.

Do you have a line on a 2.5" exhaust manifold yet?

MBHD

12 port SDS EFI