Headers with stock exhaust

[Frank the tank]

I want to keep my car stealth so, will putting a header on with a high flow cat and leaving the stock exhaust get me any gains? Or do I need to go with a Cat gack exhaust along with the headers? I do plan on a Hondata reflash once my warranty is up.

[beans]

are your concerns visual or auditory? if it's just auditory, then i suggest you get the apex-i ws2.
i sometimes switch between stock and aftermarket exhaust and i can say that there are some gains from stock.

[mikehmike]

Originally Posted by beans

are your concerns visual or auditory? if it's just auditory, then i suggest you get the apex-i ws2.
i sometimes switch between stock and aftermarket exhaust and i can say that there are some gains from stock.

eh I was just about to suggest the WS2, that exhaust had nice dyno numbers and the sound is bascially stock.

[MTuning]

u can go custom with a twin loop. you're really wasting your time if you are going to put the work into installing a header and not do an exhaust while you're there plus the restriction of airflow.

[mikehmike]

Also you need to make sure the piping matches on each or you will be bottlenecking yourself, IE 2.5 header piping (just example) and then goin to a 2.36 exhaust pipe = bottleneck

[nnightingale]

HFP looks damn near stock it is a axle back and has the oval shape to it

[Excalibur]

^that plus the stock muffler will sound like crap after a while.

[mikehmike]

I would just get the WS2 like stated above...if I wanted to stock look.

[NitrousG35]

A friend of mine from Minnesota put a Vibrant RH w/hfc on with a stock exhaust. He was not happy with the dyno results or the performance on the street. He soon got a Vibrant cat-back to go with the header.

By using the stock exhaust, not only will it have a stealth sound, but the performance will be stealth as well. You won't even notice much of a difference.

[nnightingale]

Originally Posted by NitrousG35

A friend of mine from Minnesota put a Vibrant RH w/hfc on with a stock exhaust. He was not happy with the dyno results or the performance on the street. He soon got a Vibrant cat-back to go with the header.

By using the stock exhaust, not only will it have a stealth sound, but the performance will be stealth as well. You won't even notice much of a difference.

[Excalibur]

Originally Posted by NitrousG35

A friend of mine from Minnesota put a Vibrant RH w/hfc on with a stock exhaust. He was not happy with the dyno results or the performance on the street. He soon got a Vibrant cat-back to go with the header.

By using the stock exhaust, not only will it have a stealth sound, but the performance will be stealth as well. You won't even notice much of a difference.

That's a false statement. Me and others have put the dcrh on w/ the stock exhaust and gained a ton. I would still recommend the exhaust.
The stock exhaust won't be stealthy once it gets raspy.

[NitrousG35]

Gained a ton Jeremy? Really? Don't think so. The stock exhaust restricts exhaust flow. From the gain my friend made, it wasn't something that was very noticeable.

[nnightingale]

Prove it on a Dyno!! haha I would like to see the results

[Excalibur]

Originally Posted by NitrousG35

Gained a ton Jeremy? Really? Don't think so. The stock exhaust restricts exhaust flow. From the gain my friend made, it wasn't something that was very noticeable.

Well, on my car, my wife's (palinekei's), Ainokea's car, riverak's car, and a couple others, it was pretty noticeable. You may get a little more w/ exhaust, but the gain is really noticeable. Maybe b/c we're using the dcrh so it doesn't have so much of a bottleneck, but still. When I had the bcrh and stock exhaust, there was still good power.

[Excalibur]

Originally Posted by nnightingale

Prove it on a Dyno!! haha I would like to see the results

I could dyno my wife's however it would have a tbs throwing off the results, plus there are alot of other factors that would throw it off. I was wanting to know how much we got from the vibrant catback however. I just don't really feel like spending money on dyno numbers when there are better things to spend the money on.

Here is a guy at the same day, same dyno. He has the x intake, dcrh, evo2 catback, and reflash.

Here's my car back in the day. I had x intake, and dcrh.


Have fun comparing them.

Also, here's another one. This is one car w/ two different intake setups. The 202 was made with the injen cai, and dcrh.
The 197 was made with the x intake (from the car w/ the evo2), and dcrh.
So with the same intake and same header, and the exhausts being the difference, the stock exhaust was actually doing the same or better than the evo2. Normally, I think that there would be a small gain w/ an exhaust, however not on our dynos, which is why I said that you notice alot with the race header even though you can make a small amount from an exhaust.

[cjackson2435]

Originally Posted by Excalibur

I could dyno my wife's however it would have a tbs throwing off the results, plus there are alot of other factors that would throw it off. I was wanting to know how much we got from the vibrant catback however. I just don't really feel like spending money on dyno numbers when there are better things to spend the money on.

Here is a guy at the same day, same dyno. He has the x intake, dcrh, evo2 catback, and reflash.

Here's my car back in the day. I had x intake, and dcrh.


Have fun comparing them.

ha its funny how the second dyno has lets mods but just about pushes the same Hp. the guy wiht the first dyno must not have broken his car in very well

[Excalibur]

Originally Posted by cjackson2435

ha its funny how the second dyno has lets mods but just about pushes the same Hp. the guy wiht the first dyno must not have broken his car in very well

That could be debatable. I always hear "it'll keep getting stronger until it's broken in" and this and that. It could be blamed on being an 06. There are just so many factors involved, however I was just trying to prove that you will feel a good amount with a header and stock exhaust even though the stock exhaust will sound like trash after a little while. That guy that made the low numbers switched to the injen cai (as did I) and we both noticed a huge difference in power.

[MadMagoo]

I have a vibrant header hfc with stock exhaust. pulls way better then stock save the $ and use the money for the reflash stock is just fine.imo

[NitrousG35]

Originally Posted by Frank the tank

I want to keep my car stealth so, will putting a header on with a high flow cat and leaving the stock exhaust get me any gains? Or do I need to go with a Cat gack exhaust along with the headers? I do plan on a Hondata reflash once my warranty is up.

Originally Posted by Excalibur

Well, on my car, my wife's (palinekei's), Ainokea's car, riverak's car, and a couple others, it was pretty noticeable. You may get a little more w/ exhaust, but the gain is really noticeable. Maybe b/c we're using the dcrh so it doesn't have so much of a bottleneck, but still. When I had the bcrh and stock exhaust, there was still good power.

Jeremy, you missed the point made by the OP. He said he was going to go with a RH w/hfc, which I assume is the Vibrant. You are comparing a straight RH [DCSports], which would show greater gains.

I still contend that the actual performance on the street is not that great. Yes, a dyno can show more hp, but the real test is not a dyno, but actual performance. Dynos are for tuning, not to show what a motor can really do. I am more interested in how a car would perform at the track before and after.

[Excalibur]

Originally Posted by NitrousG35

Jeremy, you missed the point made by the OP. He said he was going to go with a RH w/hfc, which I assume is the Vibrant. You are comparing a straight RH [DCSports], which would show greater gains.

I still contend that the actual performance on the street is not that great. Yes, a dyno can show more hp, but the real test is not a dyno, but actual performance. Dynos are for tuning, not to show what a motor can really do. I am more interested in how a car would perform at the track before and after.

That's fine. I was just throwing that up there for the other guy. Everyone can make their own choices on what to do. I would recommend the exhaust as well (not the evo2 lol), however I've never had an issue with a rh and oem exhaust not making power.