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Making something for performance not sound.


kevinbmx77

Well-Known Member
Joined
Sep 3, 2014
Messages
397
Vehicle Year
1994
Transmission
Manual
I want to just replace it from the cats back with parts and tubing i can buy from the auto parts stores nearby?

I really couldn't care less about the sound, just want it to work better. I have a 94' standard cab v6 3.0. I have unbolted it behind the cats in the past and felt like i had alittle more power but maybe it was just the sound messing with my head.
 
kinda wanna do something like this for the hell of it but its whatever preforms best
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Changing the exhaust will not create or reduce power, it will simply shift the peak of the power band. Making the shift can affect fuel economy. The factory exhaust is setup to balance power against fuel economy.

As one exhaust pulse moves down the pipe is creates a vacuum behind it that helps to pull the next pulse along. This is called "scavenging". If your pipes are too small they become restrictive and this doesn't happen because you create a backlog, so the engine has to work to push the exhaust out. If your pipes are too big you also loose this effect because there isn't enough exhaust being produced to create the scavenging effect and the engine has to work to push the exhaust out.

Also, the cats are designed to help in this method of operation. When operating properly they help contribute to proper flow through the system.


If you increase your pipe size between 1/2 and 1 inch after the cats you may gain a little more low end, but you will lose something at the top. If it's a bit more pep on take off that you are after I would suggest upping the pipe size about 1/2 and inch after the cats and putting in a glass-pack muffler. Traditional mufflers, with their baffles, are the biggest actual restriction in a factory exhaust.


I am not trying to discourage you from anything, but it sounds to me, from reading a bunch of your posts, that you are after cheap performance. There is no such thing. If you want real power gains it is gonna cost you.
 
Im just not sure what other things i can do to add power, i dont have much money but saving up for stuff is not an issue. Main reason i want more power is to make up for the 31" tires im about to throw on
 
Oh and thank you for always answering my questions, much appreciated [emoji1]
 
Im just not sure what other things i can do to add power, i dont have much money but saving up for stuff is not an issue. Main reason i want more power is to make up for the 31" tires im about to throw on

Your best bet is to save up for a re-gear or an axle swap to 4.10's. 4.10's are "common enough" that with some looking should be pretty reasonable to locate, and should be fairly reasonable to accomplish compared to other mods (just pay attention to how it all comes apart). This will help with the feeling of acceleration, and that the truck can get out of it's own way. Remember to re-do your speedometer afterwards.

I re-geared my truck from 3.73 to 4.56 with a tiny 29" tire (but I have the 4 cylinder). Felt like a whole new truck, and drove/shifted like it was supposed to. I haven't regretted it for a minute.

As for your previous exhaust mod, it was likely just messing with your head. As adsm08 mentioned, the muffler is the biggest restriction. BUT with a stock 3.0L, it's not as large a restriction as you might think.

And yes, real power = $$$. A muffler/exhaust is not going to make any substantial improvement on a older stock engine. Especially a N/A, stock 3.0L V6 (sorry). Some of the modern big engines it can, especially turbo engines (but those are a different animal). If you really need to have less restriction, get a Y-pipe, and run 2 mufflers. Bam, restriction is cut in half.
 
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