Stock 4th gen autos in good tune put down about 150-155fwhp and the 5th gens put down about 165-170fwhp.

Dave

 

Each header pipe is 2.5"? Or is the collected pipe 2.5"? Cuz that seems like an awful big tube for one cylinder and a NA V6. And also, careful tuning has to go into the header tubve length, the length of each individual tube from each cylinder. Too short and you lose power, too long and you lose power. I don't remember the formula but I'm pretty sure there was one. And from what I've seen (no personal experience) 5th gen auto's stock dyno about 165-175ish. If Kev's was that low modded no wonder he won't take the SC out to the track! J/k. But I think it might help the 5th gen more with the 5th gen's better intake.... if the headers are designed properly.... And Don I know you cleaned out the manifold, but wouldn't that be making the itnernal piping too big and not very smooth (sorry, i really can't comment, don't know exactly what you did).... i'd be interested if Don would want to look into designing and what not some headers but I think this company in NZ just screwed em up... But then again, i could be blowing smoke out my ****...

 

emax95: Thanks for testing these out. But I have a suggestion: If you check for a leak and see that there isn't one..why not let a 5th-gener try out the headers..and if it works for them..with noticable gains..they can buy it off you..?

Just a thought.

 

Letting a 5th gener borrow them is not something I want to do. It cost me $260 to put them in and I am not about to pay another $260 to have them removed.

 

Most headers for Civics are equipped with the so called "Y-pipe". They gain quite a bit of horse power. Maybe if you get the Ypipe, the gain will be significant.

I think the gain in your high end is pretty good! I mean, 10hp! It's not bad at all. Combine it with SC, Y pipe and other goodies, the header will show its potential.

 

The headers include the y-pipe built into them... thats whats making it hard to see if this is worth more than a y-pipe, cuz the gains arent really that much more, if any. (hard to say)

 

I just found 2 exaust leaks! I went underneath my car with the engine on and did not see anything so I asked my dad to rev the engine up a few times and sure enough there is air leaking out in 2 places! Water bubbles were even comming out of both of them. My 1st leak is right in front of my flex section on the Y-Pipe and the 2nd leak is were the B-Pipe connects too the muffler. I wonder home much HP and TQ I could be loosing from this? Tomarrow I am going to go to my mechanic and have him check the manifolds too since I can't really reach up there with out a lift. What do you guys think?

 

hmm. Well a guy at work had an exhuast leak on his pickup truck. He said the truck was very sluggish and slower off the line than normal. He had it fixed and back to normal power.
May be a cause for a few hp loss I would assume and more tq than hp

 

If your leaking like that your missing alot of power!!! My friends car sprung a leak on his exhaust manifold gasket. It went from about 270 to 90 hp with not get up and go.
Get it fixed and re dyno. This may be promising.

 

I don't know if it can be that dramatic, but my friend's Z28 was doing a baseline run of 282hp but a leak was discovered at his cat/b-pipe connection and b-pipe/muffler connection. They corrected it in 10-minutes and dynoed 294hp. Now, I understand, it is a V8 but that is a big difference. This is why I suggested this.

As for tuning, I definitely think it is a big difference. The same Z28 on same day had a new spark plug distributor, wires and plugs plus riched up the fuel and dynoed, 307hp. I personally feel that the Max V6 is running a little lean so riching up the fuel should help out too.

 

its pretty amazing that emax gained hp with leaks........

 

Exhaust leaks can attribute to power losses, but the leaks have to be pretty big to really suck out a lot of hp/tq. If the leaks you have are only the two around the Y-pipe, then you might gain a hp or two. If you've got leaks around the ports where the header meets the head then you are pretty much screwed and you can throw those headers away because it would mean that the mounting face is warped. The bolts holding the headers on should only be at 13-15 ft/lbs. Let the exhaust cool down and feel around the front header. You should be able to reach that all around. Be careful though, they will heat up fast. You might have to do one test from above and then one from below. A bad leak at the head can lead to pretty substainal losses in power, however if the leak was that bad then you'd hear your car from 3 blocks away. My buddy cracked a manifold stub on this 5.0 and it was the loudest street car I ever heard. I literally **** my pants one morning when he started it up 50 feet from my window.

Goodluck!!


Dave

 

Thanks for being the test pilot brother!! Curiosity does not kill the cat but after 9 tries, time to get a new max! lol! Thanks.

 

I felt around my front header and did not feel anything leaking. I will take my car back to my mechanic tomarrow probably and have him put it on the lift and make sure all the bolts are tight and there are no leaks. I don't think I am going to dyno again once the leaks are fixed unless some one can per$uade me. I do however plan on Dynoing when I put my UDP on and do a little tuneup.

Thanks for the input fellas.

 

Heres a link to my dyno's, I scanned the dyno tables and charts. http://albums.photopoint.com/j/Album...a=13629946&f=0

 

again with the thank you for pioneering this product:

as far as how well it should have and did perform, you will never get performance like a civic or an integra gets from headers because its an entirely different engine and setup..

the headers really do need forced induction like Don said.. it's what will really push the air through there.. and another thing is that you have the restrictive stock cat and res on there robbing some power.. and those engine leaks do not help ONE bit..

Another thing to consider is that some products dont work well together.. this is in small cases but you never know this random company's headers may not breath well with your catback or with you high flow intake..

so many different variables, good luck

 

I have a RT cat and I have no resonators. My whole exaust is 2.5'{high flow}.