Exhaust System Upgrades

The header can be ported to match the diameter of the exhaust port. Most aftermarket headers are too small or they don't line up correctly and then you would port match the headers to the head.

 

How can we get more power from the Exhaust?

Headers= How much performance

Cat Back= How much more performance

What about the cats? can they be removed? Modified(say if it were for off road use only) would the ad gain?

I Don't care about sound, only GAINS
I was thinking of getting a full exhaust(headers all the way back) and what ever it took with the Cats....off or on....What the hells is the best situation?


Any pros on this subject!

 

I'm not a pro, so take my advice for what it's worth.

There are a lot of products out there. They all claim to have various increases in HP/Performance which vary from 5hp to 10 or 15hp.

I personally don't see how you could get much gain from a new muff if you have the factory heads and intake still on. With just a basic understanding of the engineering behind engines, I would think you would need to have the same amount of diameter leaving the engine all the way back to really make a difference.

I do think that removing the cats would help. Doing so would remove a lot of restriction, but again, if the muffler isn't high flow enough, it probably won't matter.

 

I am just going to let the TRD exahust rust off and run straight SS pipes from the headers out the back and be done with it.
I`ll have them bent behind the rear wheels so the gas does not annoy the tail gate op.
That small 4.L six mill can`t make too much noise.
I may preempt it. That is national policy now.

 

Hey sounds realistic....... SO Why would someone want to spend 1000 bucks on headers/pipe/cats/muffler for a few horses?

I don't want it for the sound.

thanks

 

Good write-up. I have been looking at several pictures on this subject and seems to me that the stock Toyota exhaust would actually flow better than the aftermarket headers if it weren't for the front cat's. I have also read that Toyota cat's don't restrict that much at all.

My question, does anybody make a aftermarket pipe connection off of the stock headers behind the front cat's, therefore removing the second cat's but still having a fitting for the sensors? This would eliminate one pair of cat's and run into the aftermarket muffler that I now have without throwing codes? Am I off on the way I'm looking at this?

 

FINALLY, Someone who knows what there talking about (or really sounds like they do ). Thank you for your input. You deserve some rep chris4x4.

 

I have dumps on my '69 Camaro, I can really feel the difference when I take the flanges off... Sounds a LOT meaner too.

 

Someone might or might not do only those things. As soon as you get into the intake (Higher Flow Natual Aspiration or Force Induction), or any other modificiations (Valves, Cam Shafts, Weight Redux) you'll see the stuff chris was talking about- Different combinations work together REALLY well..and some are downright horrible.

You have to figure out what you want the truck to do and then work all your mods together to get that in the end.

 

if you can try to buy hearders, exhaust etc, not from TRD, they are a big waste of money for items you can buy elsewhere, for instance, gibson, downey and a few others make headers for half the price, and mbrp makes a sweet dual exhaust kit for cheaper than borla...shop around, also keep in mind what you have for an intake will help out lots

 

Thanks Chris that's what I was looking for. But at $300 + for a couple HP I'll have to leave it alone.

 

This thread is as good as any- I guess I'll throw this out there. Has anyone found a cat-back or full set up (non custom) that dumps out in front of the rear tire insted of behind it??

I'm thinking that in the next few months I'm going to get a set of DT Headers, the URD Y-pipe, and a MBRP tail, unless I can find an exhaust that goes out in front of the time. (I'll be getting the URD TCAI too)

 

just curious if anyone has tried to use an "x" pipe from cats to duel mufflers? If so how was sound and performance. I have a muffler shop that tells me they can probably do this for me.

 

TRD does not make headers.