exhaust mods?

[exotickoncepts]

I have a 91 sy #1601 and am wandering about mods for the exhaust. I want to keep the stock tailpipes and am wandering what will give better gains, flowthrough mufflers or removing the cat? The motor is all stock and is going to stay that way. Im just looking for small mods.

 

[dgoodhue]

Re: exhaust mods?

Removing the cat causes over boost with the stock wastegate setup. IMO neither would be your best gains especially if you want to keep the stock tailpipes. I would look into the basic stuff (tune up, Fuel Pump, Fuel Pressure regulator, IC Pump), scan tool and a 3 bar chip.

 

[SY756]

Re: exhaust mods?

^^^^ What Dave said.
You have to watch it when you open up the exhaust with a stock turbo due to the possibility of overboost. Also, get a aftermarket boost gauge.

 

[SyTyJedi]

Re: exhaust mods?

And search...

 

[wantingasy]

Re: exhaust mods?

Here's what you need to do...... Keep the cat and just get a local muffler shop to weld in a piece of pipe where your muffler is. You'll be running with only the cat and you shouldn't overboost, it will sound really good, and you should gain some hp..... :2cents: Oh yeah, and you'll have your stock tailpipes

 

[Flyin Ryan]

Re: exhaust mods?

You could always get a y pipe or exhaust cutout welded up and open it when you want the sound... then close it when you want to actually use the power without overboosting... or take the turbo off and have the wastegate side ported to handle the extra flow of the open exhuast

 

[exotickoncepts]

Re: exhaust mods?

I was just wandering if I keep the cat in but put 2 strait pipes in place of the mufflers will I have overboost problems? My truck is all stock.

 

[gjp]

Re: exhaust mods?

I was just wandering if I keep the cat in but put 2 strait pipes in place of the mufflers will I have overboost problems? My truck is all stock

That should work ok. My truck was overboosting without the cat. Now I have a highflow cat and atr 3"ss exhaust. It sounds good but I wish it had more of a V8 sound.

 

[QUICK STORM]

Re: exhaust mods?

That should work ok. My truck was overboosting without the cat. Now I have a highflow cat and atr 3"ss exhaust. It sounds good but I wish it had more of a V8 sound.

can't get that sound unless you have two extra cylinders:rotf:

 

[exotickoncepts]

Re: exhaust mods?

Thanks, I was just making sure that it will be ok by leaving the cat on. I know removing the cat it goes into overboost. But didnt know if removing the mufflers would have the same effect. Thanks.

 

[gjp]

Re: exhaust mods?

If I had 2 more, it would be a 350.

Most trucks dont overboost without mufflers as lond as you keep the cat. I use a boost controler so I can turn it down when my wife drive it. LOL

 

[QUICK STORM]

Re: exhaust mods?

you let your wife drive it:lol:

 

[gjp]

Re: exhaust mods?

Yeah, when we go out she likes to yell at honda drivers. "If your wing is any bigger, you will need an in-flight movie"
The first time it shifted into 2nd she thought he hit something. Yeah it shifts HARD!

 

[exotickoncepts]

Re: exhaust mods?

I just removed the mufflers last night and put in straight pipes in place. It runs a little better, just overboosts a little when you step on it and kick it out of overdrive. Thanks for all the advice guys.

 

[gkrcr882]

Re: exhaust mods?

Great to hear that you got what you were looking for! We don't have a cat, just a cheap Afterburner muffler and ours sounds awesome:rotf: