found these headers
Lead Lap
Joined: Mar 2005
Posts: 755
Likes: 0
From: Ca
OK, first the good. I tested the car again whit the g-tech (I don't know how good these are but they at least seem to be close) Before the header I tested the HP putting in that the car's weight was 3500 lb I think it weighs more than that but I just put it in for testing reasons. After a few runs the best I got was 119 hp NA and then I ran 171 hp on the bottle with the 75 shot. After the header and mid pipe install the g-tach said that I ran 151 hp and 197 hp on the nitrous. I don't know how it could gain this much but it feels allot faster in the mid range. Before the header when I would start hard off the the line with no nitrous it would bog down a little after the tires would hook-up. It would do this at what ever RPM 3, 4, or 5k. Now there is no bogging I am very impressed with the performance. Also the g-tech says I took 1.3 seconds off my 0-60 no nitrous and .5 off with nitrous. I'm happy with this upgrade.
Now the bad. I don't like the way it sounds with the header. There is allot more engine noise and it isn't the engine noise that I like. I think that I will wrap the headers to cut down on this or put on the flowmasters off my sc400 also had change the o2 sensor location because they had it pointing right into the firewall PITA. Also some times the header to mid pipe flange will rattle against the frame because they are touching. Not sure what I will do but I think I will try and bend it just a bit.
Over all I'm very happy with this item. I have some pics that I might be able to post if there is interest.
Now the bad. I don't like the way it sounds with the header. There is allot more engine noise and it isn't the engine noise that I like. I think that I will wrap the headers to cut down on this or put on the flowmasters off my sc400 also had change the o2 sensor location because they had it pointing right into the firewall PITA. Also some times the header to mid pipe flange will rattle against the frame because they are touching. Not sure what I will do but I think I will try and bend it just a bit.
Over all I'm very happy with this item. I have some pics that I might be able to post if there is interest.
. Alot of people who have installed the Xerd headers. Had similar reports of rattling when they initially installed them. Then realized it was due to a bolt being loose.
Make sure you dont have any bolts not tightened down. And dont forget the bolts on the heatshields. As well as any exhaust supports you may have forgotten to reattach.
Yes, all the nuts are tight. Maybe I just don't know how the I6 should sound like with headers. At WOT it has kind of a turbo like sound but maybe I'm just use to how and GM V8 sounds when you add headers but I've never felt such a change in performance after headers.
I can only validate what the gtech read. I have read that they are very close. Also I put the weight of my car at 3500lb's with me (180lb's) just as a benchmark for all tests. I think my # are higher that. By the way I beat a 02 Firefird V8 20-100 mph the other day (I was on the bottle). FYI the BFI added an-other 11 hp. So now I'm almost up to where I started on the bottle (There is little or no need for nitrous in first gear) The BFI also took another .15 seconds off my 0-60 No nitrous.
I will change it but would like it to last a few more months. Nitrous adds HP but even more torque.
Lexus Test Driver
Joined: Nov 2003
Posts: 814
Likes: 2
From: Tennessee
Now what you need to do is upgrade your clutch to a centerforce clutch
DF522018. Then get an SAFC installed and get it tuned on a dyno with a wideband and you should gain some power and i don't doubt that you will be in 200+ rwhp off the bottle.
DF522018. Then get an SAFC installed and get it tuned on a dyno with a wideband and you should gain some power and i don't doubt that you will be in 200+ rwhp off the bottle.
i can't really tell by the picture but did the obx midpipe eliminate the stock cat and was it 3 inches? since some local shops are going to charge me for the same amount just for 3" midpipe which is not even mandrel bend, i think it's probably better if i just buy the obx header/midpipe instead but i'm not going to be using the headers since i'm going na-t...
Last edited by SC300_704; Oct 20, 2007 at 11:03 AM.
Lexus Champion
Joined: Sep 2006
Posts: 1,626
Likes: 8
From: Kansas City
Yep, I've got the DF clutch, and an SAFC that I street tuned myself with an AEM wideband. Intake, exhaust, pulleys, and my car runs pretty good for being non-turbo.
i can't really tell by the picture but did the obx midpipe eliminate the stock cat and was it 3 inches? since some local shops are going to charge me for the same amount just for 3" midpipe which is not even mandrel bend, i think it's probably better if i just buy the obx header/midpipe instead but i'm not going to be using the headers since i'm going na-t...
Ill post a sound clip latter today.