So on the DE only, I know the following...

1. A PIA to install (4-5hr labor, need a helper, lift makes life easier)
2. Not really worth it (or un-dyno-proven) in whp if DE stock-cammed NA.
3. Long Tubes have better potential than shorties.


Would LTHs be worth the hassle with N2O? If so how....low, mid, top-end? Any real gains outside of the 7-10whp crap?

I realize results for HR and cammed DE's may differ, so looking for opinions for sprayed stock DEs.

Curious to know if LTH would magnify the whp/wtq results of a particular shot. Say at 75whp jetting could you get 100-110whp from the headers assuming constant tuning parameters (timing, afr, etc)

Only general info found seems to be in V8/drag forums, but not VQ35DE-centric

 

I have Megan Lth on my de. I made 262/243on stock tune. only took 2.5 hours to install.

on 150 shot I made 397/441

 

Stock cam right?

Dynojet?

I ask cuz I am following the PPE LTH thread with interest.

 

yes stock cams on a dynojet.

 

262 NA pretty good...what was ur baseline pull? And what was ur net gain?

 

that was just running it to see what it made n/a. I have never got the car tuned n/a. only tuning I have is for nitrous. I plan on getting it tuned now that have the 4" intake and 75mm tb and I'm hoping with those parts and a real tune ill see 290+

 

i have ppe headers and a tdx2. i will say for sure the car was stronger on nitrous with the ppe's. anything you can do to increase exhaust flow will increase power on nitrous because it allows the engine to expel more exhaust gas and take in more of a clean (and in this case nitrous enriched) intake charge. i would recommend it for someone hitting that 150 shot level trying to push the limits... if you are running 100hp shot or less then you clearly arent after peak power, in which case id say the ppe's make your car very loud and racey. it might not be what you are looking for. i like it, personally, but it took some getting used to. if you are looking for something less obtrusive and more mild for your daily driver, i would recommend art pipes to go with your exhaust. they will also help out both na and on n2o.

 

Thx Jake. I am ok w loud and obnoxious, attention getting exhaust note (reflects my personality I think!). My thoughts exactly on the exhaust headers. I am trying to get more out my shot size, rather than always upping jets.

If I pull the trigger it will be either...

1. PPE or Fast Intentns LTH
2. Tomei shorties with my existing HFC

Both will probably yield the same whp +/-under N2O I would guess.

 

Headers will allow the engine to expel more exhaust gasses out more efficiently, thereby making more power. I'm not going to bench dyno and guess how much, though. Whether it's worth it or not really depends on how much you value your time, money, and the potential gains.

As for your option 1 or 2, the first one will make more power. You're comparing cats (high flow or not) to a straight pipe. If you're not looking for absolute max power, then the difference shouldn't really matter.

 

yea, if you look at denchan350gt's dynos in the ppe header thread you will see that the ppe'd put down substantially more power than shorties and art pipes! my car is definitely faster with them. i had to do a little tuning but it wasnt what i expected. with the stock manifolds i had to richen up one bank because it ran lean. after the header install, that bank ran rich (since it was richened up in the tune). i took that extra fuel out and it fixed it. its crazy. i always thought it was the intake manifold that caused that, but apparently the stock exhaust manifolds have something to do with it!

 

if not going long tube, the best bang for the buck shorties are oem Vq35HR or vq37VHR headers f

 

Damn you guys..I feel myself being drawn into the LTH route..lol. I see the 900-1K flying from my wallet. JuicnJake seems to be my close test case out of the PPE thread, as our setups are similar.

"...that said, i did testing on nitrous tonight (125whp shot nx/nano system). the car was definitely stronger on motor but it made an even more dramatic difference on the bottle. ive had nitrous on all my cars. anything i could do to free up exhaust flow always netted gains that could be felt on nitrous. the gains with these headers were very impressive! its just a rocket! ..."

Any dyno yet post install?

I assume the bank that went over-rich after LTH was Driverside? which is weird as I thought that one had lean tendencies on DE.

 

Thought of this but I had thought the triangular mating flanges to the cat\testpipe on HR differ in size to a DE. Therefore not feasible due to fitment issue.

 

Again- thank you for this. The most complete read is on the G35 forum Denchan350gt (a.k.a. DSSkyline on G35) differs from me a bit. We both are 5AT, but he is cammed and I am stock cam. When he swapped out to non-stepped 1.3/4 tubing he had better low end response than previously stepped. Thread pages 18-22 discuss and link to a stock cammed DE running the SG-M stepped LTH that only produced 11.4whp. Most 20+whp gainers are cammed-nonrev, revups, HRs, VHRs.

Any dyno that you may have pre\post LTH header+125nx would be of great interest to me. We are both non-rev?...run similar jetting, you run MREV2+spacer (I have the spacer and considering an MREV2 polished in-n-out), and i believe you are still stock cam?, but considering aftermkt.

 

After reading everything out there I believe this route makes the most financial sense ($/whp) ratio on a stock DE with no aftrmkt cam even when adding the additional cost of a HR TP to mate up to it.

Thank you all for your input.

PM me if anyone has HR OEM headers they are looking to dump.

 

If you are going to use HR headers u have to use HR test pipes, or HFC. You also have to swap the two middle exhaust port studs around.

 

Like as decribed in these instructions right? <attached>

 

Yep, best way to do it is to lock to nuts together on the stud and use the torx bit key, turn both at the same time. Using the key only will snap the head off the stud.

 

Thanks again CLyons...I pulled the trigger on new HR OEM headers, new @ $354 less $150 credit card reward = $204. Can't beat that with stick for equal length shorties on a DE. With gaskets, xtra mounting studs (case any get hosed), and CNT res TP's I am still $500 less than those damn Tomei's. Both of which will probably net 10whp at the end of the day.

 

plan for an all day install