I recently picked up a LSXRT intake manifold complete with fuel rails and a 90mm tb from craigslist, I called around a couple shops and they didnt know if it would be a good combo to bolt onto my Lq4, I have other planned mods to like a cam and stall converter possibly 410s and a turbo. I would like some opinions on if this set up will be too much for my engine?

 

Everything else stock it will be a bit much, but theyhave been shown to make power on evan a stock LS1. Once you get the cam and converter is when this intake can really be appreciated. I don't think that this manifold is your best choice for FI since it is composite. There have also been some issues popping up about quality control and leaking... I can't really say much about that though.

I'm sure you'll get some good insight on here.

 

I read the exact opposite about boost and this intake manifold and I have heard it will hold a nice amount of boost, and it makes a FI set up really come to life. As far as the quality control issue I have checked mine after reading the post on the leaking lsxrt and I have to see "seems" like its fitting properly when fitted down correctly. The previous owner had it installed on a 5.3 but it was a bit much for his set up.

 

Ive tested the LSXRT on a stock LQ4 and it made 26hp.
Ive also tested it on a stock 2008 5.3L Silverado and it made 23rwhp

The LSXRT can withstand 60lbs of boost according to FAST and GM Hi Tech did an article on a boosted TBSS. The LSXRT made 50rwhp over the stock TBSS intake

Fast LSXRT Intake Manifold Upgrade - GM High-Tech Performance Magazine