air induction/exhaust 1990 TBI 350

[shawndzugas]

What has worked well as far as induction mods for the 73-87 body style. My 1990 suburban is a carryover of that style. I can't find a cold air induction kit for it like my brother runs on his 2000 sierra. My options are either an open element K&N or an unshrouded Airaid copy. Exhaust--uprgrade to dual cats and flowmasters, single high flow, etc? Thanks for your thoughts, Shawn

 

[Catman]

On my '90 K5 I run a K&N air filter in the stock housing, an Airaid tbi spacer and a Flowmaster II cat-back exhaust. It definetly has more power and got about 2 more mpg. This weekend I'm adding an Edelbrock cam and intake manifold. You are right in the fact no one makes a cold air induction system for this year. I tried to make an Airaid system for a 1988 pickup fit but the coolant tank and the AC tubes get in the way. /forums/images/graemlins/thumb.gif /forums/images/graemlins/k5.gif /forums/images/graemlins/usaflag.gif

 

[HarryH3]

I made a dual air intake for my '90 Sub. The intake from a 4.3 liter TBI S-10 has the snorkel on the drivers side. I cut off the snorkel and then fit/welded it onto the stock air intake so it now looks like a factory dual setup. /forums/images/graemlins/thumb.gif Route both hoses to the grill and you've got a poor mans cold air setup. /forums/images/graemlins/cool.gif

 

[sled_dog]

an intake kit off a 1988-1995 Chevy pickup should work if you insist on an aftermarket K&N or whatever intake system. My 1995 had one, it was a really nice piece, I wouldn't have paid the $200 or whatever for it but yeah.

 

[dyeager535]

Exhaust, headers will go well with opening up the rest of the system.

Good gains from them, just not as "fix and forget" as the stock manifolds.

 

[Thunder]

Go here:cfm-tech.com
Get the stuff out of the box that says 40 HP for 265. That with a K&N filter will do far more than any aftermarket CAI you can buy.
The stock CAI system is fine. It will flow more air than a Stock TBI system will ever need.
Do not run a open element filter with TBI unless you want to loose HP.

For exhaust I recomend single 3" pipe, high flow cat, and performance muffler of your choice. Flowmaster, dynomax, ECT ECT. Headers will also help

 

[skratch]

Using an Injector spacer is supposed to help according to thirdgen.org

I have a K&N in the stock housing, and edelbrock TES headers, you can definatly feel the difference in it now.

There is a vacumm adjustable fuel pressure regulator, I used to have the GM part number for it, but if you go to 454ss.com and search a bit, you can find it too.