I have a 2004 g35 sedan, looking to put in new headers with HFC before a tune. Would there be a big difference between Nismo/Tomei headers, and something half the price, let's say Stillen's? Stillen is a good company, right?

Also, would a Tomei header for a 2003 g35 coupe work on a 2004 sedan?

Have been searching for answers, but not finding anything...


Thanks!

 

Stillen makes great products. We're an authorized dealer for Stillen, as well.
Give me a shout if you have any questions.

 

Tomei headers would fit the sedan. I have seen a dyno sheet of Tomei's make more power than another set of headers, about like 10whp. Forgot which ones though pm Gabe3d.

 

I've heard Tomei are the best - next to the SASHA long tubes. This explains the higher price.

Any header is better than the stock manifold. Problem is the cost of labor is generally high due to level of difficulty and lack of room to work. Most people won't do it themselves and can't justify the cost.

 

It's a lot work and money for the minimal gains (~5whp to 9whp for most brands) you'll get in return plus the underhood temps elevate significantly which can prematurely deteriorate rubber components and cause heat soak issues with exposed intake systems. The OEM manifolds are ugly, but they're not terribly restrictive, especially for a typical bolt-on VQ35DE. Not until you add parts that truely change the motor's ability to breath in the upper rpms (ie cams), would headers truely be benefical. There are companies that make long tubes which will make the most power, but you'll give up the cat converters which will result in a significant volume gain with much of that volume not being a sexy sound.

If you choose to go the header route, make sure to research the brands very closely because some brands have quality control issues. Common issues include interferance with the steering linkage, pipes running dangerously close to fuel lines and other lines, and pipe clearance issues with the mounting studs. The last thing you want to have happen is get the OEM manifolds out, only to find that the headers don't fit properly. It's very common.

 

I am happy with my DC Sports.

 

1. SG long tubes
2. new design Tomei headers
3. Nismo headers
4. Crawford
5. stillen/strup/dc
6. topspeed
7. all other ebay variants

rated them by cost/power/rarity.

 

I was under the impression Crawford Z's were better than Nismo's/

 

^+1

 

they are close... I just like nismo design better, crawford are pretty ugly.

 

Top Speed, as in the Texas (Dallas) based shop, their headers are on sale for $199 (reduced from $399). Should I go for these or Tomei (used for 7k) for $550?

 

I prefer the function over the form.

Many reviews point toward crawford z's as a better buy for what it is.

 

What people sometimes forget is that there are tons of ways around things. Rather than go though the hassle of an expensive install, ease the installation. This being said there are several tricks. The main one is to ditch the stock manifold bolts and go with arp manifold studs. By doing this your shop of choice will not need to separate the steering or remove the coolant lines. This will save you about 200 bones and cut install times by about 2 hrs. The miami scene is super wealthy in aftermarket knowledge. Just meet up with some of the guys down there and there are also several mechanics in the group. Talk soon bro mike

 

Check this https://g35driver.com/forums/intake-...manifold+bolts

 

Interesting. Do you have pics?