Straight Pipe ? test pipe VS high flow cat

[Acid X]

Yeah, well, i recently bought a test pipe just to throw on the car... Ended up having a hell of a time trying to get the cat bolts off. Turns out they were rusted so bad they fused with the flanges and studs on the cat... So i took it to my exhaust guy to see if he could salvage the flanges and get the test pipe in... But he said there was no way he could do it without damaging the flanges.

So instead, he says he can just weld a pipe straight to the back of the downpipe flange. (He cut the cat out, and welded on to a piece that is part of the cat-side flange)

So now i'm running 2.25" all the way back to my muffler which is 2.5". The car is looouuuddd. But its not too bad.. I've heard much worse.

Has anyone else done this? lol

EDIT: OH! And the car runs sooooo good.. It's atleast 10% faster without the restrictive cat + stock exhaust ... Or atleast it feels like it!

2.00" and 2.25" are okay for mild aftermarket improvements, we fall around 1.75" stock and thats what our cars come with, it doesn't account for the stock cat or muffler though. When you think about it the "DEMAND" for exhaust flow is not constant... as RPM increases so does the need to flow more exhaust.

125 hp x 2.2 = 275 cfm
1.75" Single Exhaust pipe flows about 275 cfm

163 hp x 2.2 = about 360 cfm
2.00" Single Exhaust pipe flows about 360 cfm

200 hp x 2.2 = 440 cfm
2.25" Single Exhaust pipe flows about 440 cfm

cat technology is getting better so you don't have to be illegal and ditch the cat alltogether to get good performance, and not many of us here are scrapping the bottom of the barrel looking for every last drop of power to win a 1/4 mile race.

Here are some high flow cats

Random Technology
Magnaflow Magnaflow Cat

CARSOUND
SMSP SMSP Spun Bodied Cat

Here is some good into on cats.
http://www.team-integra.net/sections...p?ArticleID=24
http://honda-tech.com/zerothread?id=1128725
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[theDougler]

yea i'm running straight pipe on stock exhaust with the resonator and a magnaflow muffler

[Acid X]

Is it loud? Haha. I know mine is.

[A18A]

Is it loud? Haha. I know mine is.

maybe a hole rusted into your exhaust, or 1 was stabbed in?!?
mine doesnt have a cat yet it has a cat light o.O wierd aye. does having no cat make a stronger exhaust presserure? coz if it dus i wanna put the cat from the other car on

[Acid X]

The only thing a cat does is restrict your exhaust flow and clean the crap that comes out of the car so you can pass emissions testing... In cali, its required to have a cat... So, uh. yeah. I'm rollin' illegal. lmao.

EDIT: Also, if you had read the whole post you would have noticed i said i put in a new exhaust system... Which is why it's so loud. lol.. Not having a cat made it a whole hell of a lot louder though.

[mkymonkey]

nice dude i cant wait to hear it at the meet since im going to do something similar. but alas i havent any money so...i have to wait a bit longer

[theDougler]

seeing that i am using the stock stuff its not too loud when the muffler guys here put in my muffler he turned it on with the cat and it wasn't really much louder over the stock so i he cut out the cat and welded in straight pipe. here i don't have to worry about emissions. but in vancouver they got aircare

[crazykamper]

anybody have any experience with the High Flow Cats off ebay?? or are they b.s..... also, if i was runnin completely stock exhaust (i need to change muffler. its a lil holey. lol.) and i put in a test pipe, will it increase sound and power??? and how much louder is it?

thanks.

[gfrg88]

the ebay "high flow cats" is what cory(acid x) is using, theyre just straight through. yes it will be louder and you will gains in performance. how loud it will be depends on other mods too. some will be louder than others.

[snoopyloopy]

i should stick my dc headers + exhaust (not dcs exhaust, lol) on and see how loud it is. or take it down to a shop and have them fiddle with all my rust-fused bolts. how much is a good price to have a shop install a complete exhaust for me?

[crazykamper]

is there a diff between the highflow cat and the straight pipe or bpipe, or whatever they called...

[Acid X]

the ebay "high flow cats" is what cory(acid x) is using, theyre just straight through. yes it will be louder and you will gains in performance. how loud it will be depends on other mods too. some will be louder than others.

I'm not using the test pipe. I couldn't get it on.. Re-read my thread buddy, lol.

i should stick my dc headers + exhaust (not dcs exhaust, lol) on and see how loud it is. or take it down to a shop and have them fiddle with all my rust-fused bolts. how much is a good price to have a shop install a complete exhaust for me?

Complete exhaust, probably about 100$ if you already bought the cat and muffler... Or whatevr you want to put on.

is there a diff between the highflow cat and the straight pipe or bpipe, or whatever they called...

High flow cat is emissions legal, test pipe/straight pipe is pretty much just a pipe that goes in place of a cat and does nothing for emissions at all.

[Versanick]

some places will charge you upwards of $400 to put an exhaust on. Be very wary. Shop around and get two or three estimates. Then go tell the most expensive place what the cheapest place told you, and see what they say. If they come down great, otherwise you know who to go through..

and I love my straight pipe.

[crazykamper]

is the test pipe better for air flow? or are they both pretty much the same?

[gfrg88]

think of it like this, what flows better a pipe with something in the way, an actual cat. or a pipe that has nothing in the way to block the exhaust. so wich one do you think is better?? still need us to tell you

[3gmodifier]

i used to have striaght pipe but i was tired of getting pulled over. luckly i never got a ticket but you only get so many warnings from so many pigs before your in the system and they say, no more warnings. it was fuckin loud though. header, 2.25 all the way to dual mufflers. i couldnt even drive soft to keep it low. you know, when a cop is next to you, and you try to keep it low. well it doesnt work. so i went and got a cheap cat put on for $80. it is still loud but not as much and the high pich ricer sound is finnaly tamed.

[88accordhb]

mine shot fire.

[crazykamper]

lol. alright, now i get it, to make a cheap straight pipe, can i just get a piece of exhaust and weld/bolt it on?? would it pretty much be the same?

[mkymonkey]

yeah dude. the only thing a "test pipe" is....is just that. a pipe with flanges on it.

[crazykamper]

ahh, i see,

is there a diff between theese 2 high flow cats(besides the price, and the fact one of them is Spoon. lol) ??

http://cgi.ebay.com/ebaymotors/86-89...QQcmdZViewItem

http://cgi.ebay.com/ebaymotors/SPOON...QQcmdZViewItem

[Vector]

my car came with pace setter headers, and also with a paper showing it passed some emissions thing, dunno why someone would volenteer it around here lol.

so basically what i'm gettin at, my car obviously still has a cat if it passed this thing, is it really worth taking it off if all i do is use the car for autox?
will i see any signifigant gain?

[crazykamper]

i say take it off if u only use it for autox. scince it says it gains power, y not do it. lol.

[aerokid1987]

Whoo, free up an amazing 2hp, lose some torque, and pollute to no end.

Ehh whatever...
I have one of those ebay resonators and a thru flow ractive stainless muffler and it is pretty loud. But I definitely noticed a gain in power after putting those suckers on.

[crazykamper]

wait, i lose torque and onloy gain 2hp?? that doesnt sound worth it....

[PortugalFocus]

Back when I had my Accord I had a stock manifold with a hollow cat and a 2.25" pipe straight out the back.

VERY LOUD