I have an 88’ L98 with cold start deleted with block off kit and new PROM and want to go with AS&M runners and a TPIS big mouth base. When speaking with ASM they mentioned I should go with 89 and up runners because I deleted cold start...I was under the impression I needed to stick with 85-88 style because of slight differences in plenum and TB? I just want to be sure before purchasing runners.

 

Both will work. 89 and up are blocked off at the flange, 88 and down you'd use the block off you have.

 

Awesome, the ASM guy mentioned that they just block off the cold start and it is the only difference between the two but I just wanted to be sure. I saw many old posts saying not to use the later runners on 88’ and under but they appeared to still be running the cold start injector. I will order the 89’ and up. Thanks for clarifying that for me.

 

For the price of those two items (runners and intake base), you could just buy a whole FIRST manifold - which will out perform it.

GD

 

I thought of that but wanted to keep the TPI look with old school go fast parts. I also don’t have enough mods to justify it with no plans for a head swap or cam on the horizon I didn’t think I would ever take advantage of the FIRST’s capabilities. I thought you needed a new ECM set up to run that as well.

 

I'd say that the stock long block is still restricted by the factory base. The FIRST? Not restricting a stock long block and not even close to it's limits. The asm runners are half way the cost of a FIRST and you still get taxed by the factory base. I won't talk you out of it but power/dollar asm is on the losing end.
Tuning? Yeah it'll help. It's maf so it'll partly compensate. Tuned Performance can probably get you sorted out easily enough though.

 

Nope. Just a tune - which you will need with the TPIS and AS&M parts as well. It uses all stock TPI sensors. Plus it pretty much looks just like regular TPI - most who aren't well versed in TPI stuff can't tell the difference.

Plus you get a new throttle body that's doesn't have clapped out bushings, new fuel rails, etc. You will need to install an external regulator but that's minor in the grand scheme.

GD