Exhaust

i would say since you are pretty much replacing every par to fht exhaust, you might as well just take it up a size while your at it, its only gonna help
 
BS backpressure does not affect torque, torque is a function of HP. Less backpressure the better. Hell run it right off the heads you will have lots of power. I havent seen any top fuel dragsters lately with necked down headers for more low end power lol.
 
^^^ Well generally every exhaust system reaches a point where too large of exhaust will cool the exhaust too fast and slow down the flow(which can increase backpressure), but in return you have a larger volume area so its usually a wash.
 
BlackLS06 said:
next restriction is the weird lookin halfass cat that comes before the resonators the H-pipe and then finally the mufflers.
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That is not a cat.

BigPip said:
Past experiance... The Hi-Flow cats WILL be worth it!
Just my 2 cents
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What experience is that? Do you have a dyno from known-good stock cats to "high flow" aftermarket ones that shows gains? One of the major issues with aftermarket cats, especially the cheap ones, is longevity. They are cheap for a reason; there are precious metals that are used in the converters that are very valuable, and there is nothing a manufacturer can do to avoid the added cost other than skimp on them.

m-waage said:
BS backpressure does not affect torque, torque is a function of HP. Less backpressure the better. Hell run it right off the heads you will have lots of power. I havent seen any top fuel dragsters lately with necked down headers for more low end power lol.
Click to expand...
You are right, horsepower is just a number that is derived from the torque. However, backpressure does impact the torque curve. Dyno with stock exhaust, then dyno with open headers...you will see a gain at peak, but the area under the curve will be less.
 
so it seems like 2.5" should be ok? i really dont want to lose any power, to be honest i want to gain as much as possible, as well as add a nice rumble!
 
BlackLS06 said:
I know its not.

I dont know what the hell it is so i gave it my own name. I dont try to be serious all the time. people are too uptight on here.
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It would be different if the majority of the folks around here realized it is not a cat, but unfortunately someone started the rumor and now everyone believes it...so I try to keep it from growing any more. Nothing personal against you, but your taking it personal reflects that perhaps you are a bit uptight yourself. ;)
 
http://www.honda-tech.com/showthread.php?t=1530154
2.5 vs 3 inch exhaust on a 4 cyl honda engine.
dyno3inchexhaust.jpg


http://www.8thcivic.com/forums/go-power-motorsports/232251-go-power-3-exhaust-vs-stock-dyno-comparison.html

Another comparison, using 3INCH on a honda 4 cyl.
Go%20Power%20K24%20Civic%20Si%20With%203%20Inch%20vs%20Stock%20EX.JPG



THere are tons of others but most show an increase in diameter=an increase in power. THose little honda 4s are running 3 inch I would think a big mightly V8 can... I got 5 inch on my 5.9L straight six truck lol.
 
Backpressure is a myth, unless you are running 2 strokes that need tuned pipes. And even then its not the pressure its the speed of sound vs your reflection cone and stinger length.
 
Booshwa And Old Wive's Tales

Magnaflow makes ONLY 2.25 inch pipes for the LS. Anything larger must be custom made. And I have a notion that most of the so-called 'technical' advice handed-out here is simply a re-statement of something half-heard and misunderstood. Just as an example, the idea that restricting the exhaust flow will ALWAYS produce greater power at some point or other is simply hooha. If a restriction makes more power, it simply means that some other part of the powerplant is wrong and it's showing up at the 'more-power' point. Remove both restrictions and the result will be of benefit.

KS
 
thank you for your input, and its always great to hear what other people know.

so i will go 2.5"

does anyone know of any tips that will fit this set up and look nice at the same time?
 
did you order them from the website you linked? i like them btw they look very nice
and the price is good too!!
now im just waiting on fastls to send me a rescent link of those high-flow cats he bought so that i can order them.. i couldnt find a rescent link.
 
I did order them from there. It was the cheapest price I could find. Their shipping was awesome. Ordered on Friday and got them on Monday.
 
Last exhaust I did on a 4.6 I used 2.5 inch straight back with the smallest glasspack on each side and 3 inch stainless tips. Nice and quiet when driving around but if you leaned into it she would make some noise.
 
cammerfe said:
You ARE wrong. Back pressure does NOTHING good. BP is created by a restriction. NO restriction in the exhaust does anything remotely good!

KS
Click to expand...

Depends were you want your power range.. having no 'back pressure' will give the range a sweet spot.. as opposed to power through the whole range.. ill find the charts after the weekend that show this..
 
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