1fastGSR

I need some help! Would the check engine light come on with a test pipe? even if it has bung for the O2 sensor? how do you turn it off?
If heard of people say that there is NO gains with a test pipe?? Is that true? If not, what kinda of HP gains am I looking to get? Thanks

Rainmaker

Test pipe does not produce any significant gains for a car with mild bolt-ons. THe light that comes on is leeting you know that you have increased your level of pollution by about 1000 times.

Rainmaker, friendly Honda-Tech environmental consultant

1fastGSR

I bet my car with no cat makes less pollution than those big *** trucks and SUV with 2 cats!!!!!!!!!

Rainmaker

An SUV can pollute up to (rough estimate) 5 times more than a car with a cat. That still means you without cat = 200 SUVs.

Rainmaker

1fastGSR

I'll just wont cut the grass anymore to make up for it!

BlowOff

Don't forget to not trim the shrubs too!!

kikkoboyie

damnit... there's been so many posts on testpipes... whats the bottom line?

its a cheap mod that provides decent gains or what?

someone set it straight.... so i can get one

1fastGSR

that's the whole reason I started this topic!!! I can NOT get a straight answer. I wish someone would post a dyno!!!!! somepeople say it makes NO HP, other people say it makes 8-10 HP. I'd be happy with 5-6 HP!!

randomwalk101

The cat is a restrictive area of your exhaust. Openning this up should allow more exhaust flow, increase hp and keep your engine cooler a little bit in the process. You will get greater gain if your vechicle if force induced, taking into account that the rest of your exhaust is not restrictive.

slowerthanu

Next tuesday I am having a Mandrel bent exhaust using a resonator and a Magnaflow muffler. The shop want's to build me a test pipe for TRACK use only.
Since the ECU JUN is building for my car will take away the OBD 2 signals I figure it will be ok, but for now is there anyway to keep the dreaded CEL away with my current OBD 2 setup.

SMSP

I had a 99 Expedition with the 5.4L it got around 15 mpg around town and 18 on the highway (2WD). It was classified as a LEV and had 4 cats, 2 for each bank. My wife drives a 98 Volvo S70 GLT that gets only 21 mpg in town and about 28 mph on the highway. Well the Volvo's emission numbers were about 3 times that of my Expedition but was only getting (21/15) 40% better fuel mileage around town which was about 80% of its duty. So, even though my SUV was getting worse mileage is was polluting less than the Volvo.

kikkoboyie

aite so......

w/ forced induction, ur gonna get really good gains with a test pipe

but w/ mild bolt ons, ur gonna get.....

sikgsr1

Why dont you take that money and go buy a BBK or JG throttle body and intake manifold.......Test pipes are a waste of money on Mild motor setups. You will get way more gain out of those 2 bolt ons.

Mike

PureTeg420

It's funny all these people that bash test pipes when they don't even have them. Have u guys ever actually looked inside your cats? There's so much wire in there it's a joke. When I took my Cat off and replaced it with a 2.5" testpipe I wasn't turbocharged, but I still felt some power gain. Not anything like 10hp, maybe 4 if I was lucky. But after the turbo....damn. If your obd1 just spend 50 on a damn testpipe, your not gonna be dissapointed. And make sure to hold onto your cat..for when u have to pass emissions.

kikkoboyie

quote:
bbk or jg throttle body is like a billion tyms more cash than a test pipe.... but if i had the money... i would def get that....

"If your obd1 just spend 50 on a damn testpipe,"

im obdII.... u think i should get one?