Okay I read the "free mods" and stuff. I'm definitely going to do that. But is there anything I can do to my TBI car to make it gain some cheap horsepower? I know I cant make big HP but with half a dozen el cheapo mods its worth one big mod right?

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1992 Pontiac Firebird (stock)
- 5.0L V8 TBI / Automatic Trans / Every option, excluding leather
- Killer car audio system:

• Aiwa CDC-MP3 head unit
• Rockford Fosgate 360a2 amp
• pair of 12" MTX Thunder 5000s in a custom box
• Pioneer 3-way 6x9s, soon to add more more more!

 

Open element, do all the ultimate TBI mods. Check out the tech articles. You could gut the cat converter but it won't make a difference since you probably have the stock exhaust manifolds and y-pipe.

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, Jon (350 TBI!)
91 Red My website

 

yes its totally stock except the muffler (which i will eventully replace- FM80)

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1992 Pontiac Firebird (stock)
- 5.0L V8 TBI / Automatic Trans / Every option, excluding leather
- Killer car audio system:

• Aiwa CDC-MP3 head unit
• Rockford Fosgate 360a2 amp
• pair of 12" MTX Thunder 5000s in a custom box
• Pioneer 3-way 6x9s, soon to add more more more!

 

You can gut the cat and go with a less expensive muffler from Dynomax or Flowmaster, etc. The Dynomax is about $45, the Flowmaster, about $75. It all depends on your budget. I wouldn't (myself anyway) spend more than $50 on a muffler unless you were gonna replace the whole exhaust. The factory pipes will do well for a cheap muffler. A higher flowing muffler alone will help HP and plus, sound better.

In all actuality, putting a 3" system behind a 2 1/4" cat isn't going to do any good at all. It sounds neat, but the cat is what's blocking the flow from the engine. It's like blowing air through a 10' straw, or blowing it through a 5' straw that goes into a 5' pipe. It ain't gonna be any easier to get the air outta the straw.

Cheap means some sacrifices, but you can work around that. You don't always have to spend a lot of green to get a lot of go.

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92 RS w/t-tops 305 TBI Auto.
170K miles and don't burn a drop o'oil
-K&N Truck filter #1500 w, open ele.
air cleaner
-Dynomax 2 1/2" cat-back
-B&M TransPak
-Jet Stage2 Chip
-180* T-Stat w/ 185* Fan Switch
-JVC CD--Alpine speakers & 4ch. amp
Rockford 2ch. to 2 MTX 12" subs

 

I don't really want to gut my cat. How much for a really great high-flow cat?

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1992 Pontiac Firebird (stock)
- 5.0L V8 TBI / Automatic Trans / Every option, excluding leather
- Killer car audio system:

• Aiwa CDC-MP3 head unit
• Rockford Fosgate 360a2 amp
• pair of 12" MTX Thunder 5000s in a custom box
• Pioneer 3-way 6x9s, soon to add more more more!

 

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