Vibrant Performance offers a 4-1 header best suited for top end and a 4-2-1 header design as well best suited for low to mid range power. These headers have somewhat of their own design in the sense of the primaries merge points. Anyone have any experience with either one of these two pieces? Here are some links.

http://vibrantperformance.com/catalo...roducts_id=553

http://vibrantperformance.com/catalo...roducts_id=558

Any help would be greatly appreciated.

 

dynoed some a while back, made almost identical power to a DC 4-1.

 

The opinion you just gave me was general to the "tee". What motor was that on? What exhaust? The VP 4-1? I have a street build 12:4:1 static compression ls/vtec 81.5 mm. Buddyclub spec 3 + cams. I want to keep a/c and I want the best header out there for those purposes. Car is not a daily driver as I commute to and from work 5 days a week through carpool. Just looking to shed some light on what the header choice should be. I havd a V2 bisi replica but was sold because I need a/c here in florida. Thanks for the input man but so general it almost invalidates it.

 

Every header ive seen on the market (replica) is a/c compatible. Except the RMF replica drag header and the Bisi replica i believe.

 

^ I had the bisi rep. Contemplated the rmf before purchasing the bisi rep but a/c is a must down here. **** that.

 

I live in miami... there are tons of other header's out there, most of which are a/c compatible and known to work. Unlike the vibrant.

 

What you suggest

 

RMF Narrow replica

 

Dunno what narrow you looked at but mine would fit ac...

And after profunctions test. . .**** A BISI HEADER

 

I need a/c though guys!!

 

What don't u understand about THE RMF NARROW WILL FIT AC!!!!

 

lol, sorry for such a general description,

so here it is, the car that was subjected to the test was a 2000 integra with a JDM ITR motor (my own personal car at the time),
B18c (jdm itr)
supertech springs/rets
3" ex, basic intake with hks filter (hks has vel stack built in their filter)
jun 3 cams
aem cam gears
DC headers, dyno tuned to 194 whp 135ftlbs
then switched to the Vibrant and made 195whp 136ftlbs
then switched to the JG edelbrock with modified collector and made 204whp 140ftlbs

all three headers was tuned out on the same day, I will try to find the dyno graphs. This was done many many years ago before I own my own dyno so I don't have the graphs on my data base, but I know I did keep a folder with all the graphs in it some where here at the shop.

 

Well I am definitely looking for a smooth power band with no weird *** dips in the mid range like the bisi rep gives LOL. I appreciate the words guys. Everyone and their mom has the rmf narrow nowadays, I don't want to have an average joe header, that was also why I had purchased the bisi rep originally but a/c is a must. May but some thought into the rmf. The vibrant 4-2-1 is styled unlike any other header I have personally seen before, that's what lured me into it originally..

 

Vibrant is 4-2-1 header here. Built B18c1, head work, cams, 11.8:1 comp, Aebs IM, BPI Stack, 2 1/2" exhaust. Decent header for the price IMO. GREAT ground clearance if you are RRing. See dyno

 

RMF narrow, or a hytech tri-y replica. Both a/c compatible. If you don't agree use google.

 

Excellent information! Just what I was looking for! I will be running more agressive cams and higher compression so I sense I will meet my 210-215 goal while still being able to retain a/c.

Dirty harry - the rmf was my original plan bro but I figured I would ask of the vibrant piece since a good friend runs it on his 2 liter itr motor and has power all throughout the band on a relatively similar build except the displacement of course.