Well there you go guys , Importt0Oner says it ture . so who are we to know better .

 

This post shows a difference of a lowly 9hp 3lb/ft for a test pipe over the stock cat
https://www.evolutionm.net/forums/sh...12&postcount=7 (you have to look at post 8 for the comparison.)

https://www.evolutionm.net/forums/sh...ad.php?t=37340
There is a post comparing the randomtech to stock and testpipe. Guess what, stock did lose 10hp. The peak loss from the randomtech was 3hp, and it actually crosses above the testpipe chart in a few places showing that most of the variation here is just normal variation. Is not being able to breathe really worth a max of 2hp to you?!

There is also a member on the board who is selling 100cell cats that he is fabbing up for fitment (here). He claims these will flow 600cfm where the randomtech flows 400ish. Cobb is holding back on their cell counts, but I would guess they are less than 300.

On that note, if you still want to be lame, the RTP I just took off after 3k miles is for sale...

 

You said "properly fitted" - umm ok so it fits... if it didnt, it wouldnt be on the car

You said "functioning cat" - that does not say high flow cat. Stock cats function too.

 

Im not recomending running without a cat on the road...........but from my first hand experience you are wrong. I have a Buschur 3" tb and with cams and a br highflow cat (brand new) I ran 318whp with a Dynoflash dyno tune. Two weeks later I swapped to a straight pipe, nothing else changed, and on the same dyno ran 331whp. I wish I could find the dyno charts....but that was two years ago. Anyway it does make a difference even with lower hp evos.

Again, if its a daily driver I don't recommend this but just my experience.

 

10-15 whp, and slightly faster spool ONCE you change to a full TBE... Right now, I doubt it will do much but smell bad and slowly kill your 2 year-old's brain cells...

 

ok, when you are done being pedantic, I'd be happy to take a look at those dynos you said you had.

oh, and properly fitted means to the engine... i.e. not too small and not too large. get it now?

 

While I appreciate that input 2 weeks allows for quite a few factors to change. In the end, I posted back to back dynos that show little to no difference. I believe derekste mentioned in another thread that he also had little to no difference in back to back dyno runs with an open downpipe on his DSM to a catted system with the AMS cat, back to back.

I'm not sure what buschur uses for their cats, but there are multiple cases of back to back tests where proper 300 cell or less metal substrate cats were used and showed little to no difference in power.

Please, I'm all about making the power on the track, but for daily driving are you going to notice the 2hp? Please hear us out. I'm just trying to say that I have to breathe this air too, eat these crops that are yielding less too, sweat this summer heat that is hotter too, and worry about a polar ice cap that will be completely melted come summer 2013.

 

Honestly, I think that if you are going to have your 2yr old in the back seat you should have a cat on the car. Those fumes are definetly worse back there.
You don't want him/her breathing that crap in!

 

1. Before you look like a tool and spread false information like this learn how to read.

2. Thats on a CIVIC that is NA with 150hp, NOT TURBOED like an evo is....comprende?

3. It has been proven time and time again that a testpipe will yield ATLEAST 10-15WHP on a typical bolt on Evo or even stock.

Just to prove I went from a 3in Works HFC and slapped on a Megan resonated testpipe and gained 14whp. Mods are in my sig.

If you don't believe it maybe you should buy an evo first instead of arguing about something you obviously have no clue about. Why does anybody have to show dynographs to prove to you what everybody else already knows. Since you have a whole 9 posts click on that big search button and find out about the 100000000 posts that prove the testpipe gains.

 

Done.
I understand that. I also understand backpressure is more important to a NA engine than a FI one, but the underlying principles of an internal combustion engine remain the same.
I'm still waiting on this one... proven by who?
Then surely you have a dynosheet?
You're right... my 4G63 powered 1G Talon with a 16G has nothing in common with an Evo

Why do people have to show dynographs? Because until you show some fact, you are just speculating. Both Frost and I have posted facts in support of our argument, and nobody from the "other side" has been kind enough to return the favor. The point is that until you start posting substantiating facts, you're only ranting.

 

when upgrading exhaust you need to start from the farthest point from the motor. catback, test pipe, downpipe, o2 housing, manifold. you can upgrade it however you want but thats the best order to go in. thats how i upgraded mine.

 

How much torque was lost? Seems like it's a trade off on mildly modded Evos.

 

im running ultimate racings 3" test pipe and could definately tell a gain after replacing the stock cat with the test pipe.

 

Speculating huh....well if you are a member on this sight I am sure you know how to use the search button. There are numerous graphs showing the gains...I am not going to waste my time posting them for you. Since you own a 4G63 with a 16g so you must make as much power as an Evo you would know backpressure is the enemy of a turboed car. But since the megazine article you posted used it on a civic you must be right. You telling me if an exhaust on a civic only gains 5hp that it won't gain much more on an evo?? You sir need to learn a little bit about cars before calling that proof. You can talk to ANY knowledgable vendor...AMS, Buschur, Evasive, TTP, Speed Element, GST....anyone and they will tell you a testpipe will yield power...it most cases atleast 10whp. I mean you don't have to believe it and you can be slower and quieter thats your decision. But arguing that a testpipe gives hardly any power is a blatant lie. Yes one of the 100cell metal substrate cats are the highest flowing but most the time those wont pass emissions and there is still some restriction...not much but there is. Since you say a properly working HFC which is usually a ceramic one flowing less that 400cfm doesn't produce any restriction you are stoned. But I'm done proving my point...it's useless trying to explain something to somebody that has no clue.

 

ultimate racing testpipe has a built in CEL fix

Its 110% the way to go!

Stick witht eh 3" its fine wont leak.