C5Natie

OK, so I know that the 1 3/4 vs 1 7/8 header debate will always continue. Ive seen dynos arguing both sides but I started to look closely at the design of these headers especially those for C5's. I noticed that many C5 owners even those with 376-418ci engines noticed either no gains or very small gains when going to 1 7/8 headers from 1 3/4 while owners of other model vehicles might have noticed more significant gains. Then one thing caught my eye, it seems that most 1 7/8 headers for C5's have much shorter primaries when compared to 1 3/4 headers. The primaries are shorter and go into the collector much earlier. This would choke them up and the scavenger effect would suffer robbing them of making potentially more power and especially torque. Maybe this is needed to squeeze the bigger headers in the C5 and through the exhaust tunnel opening and by the batwing oil pan? IDK, what do you guys think?

LG 1/3...TSP is almost an identical design,



ARH and Kooks 1 7/8,

C5Natie

TSP 1 3/4, 32in primaries,


ARH 1 7/8 headers. Better design but still shorter primaries vs 1 3/4,

C5Natie

So no one here looks into these details?

m6 c5

I had noticed this as well. Lg's 1-7/8 primaries are also shorter when compared to the 1-3/4. If Im not mistaken kooks are the same lenght either way if you get 1-3/4 or 1-7/8

darkvader0

Is there any new thought on this?

I've recently crossed over from the F-Body world to my 03 Z06. I was set on 1 7/8th since that is what seems to work best in my 99 Trans Am. It appears different for the C5 configuration.

I saw a photo and it looked like the LG 1 7/8 had much shorter primary tubes than their 1 3/4.

Anyway I feel like I am starting over again with my research after having an F-Body for 10 years. Seeking out the best header for my needs again and came across this unique thread.

Ohyoufan

Here's something else I've noticed too; Kooks, LG, etc all have their x-pipe near the rear of the car, while the ARH's x-pipe merge is directly after the collectors near the front of the car. What does ARH's x-pipe placement gain/hurt you? How does it affect the sound too?

LSOHOLIC

If your truely interested in performance. Then this link......

http://www.epi-eng.com/piston_engine...technology.htm

......will tell you more than I can type in an hour !!

If you worried about sound....well, you better stick to the "vette" catalogs, picking out your shiny cat back system.....

IMO, people get confused because they do not buy for their style. Meaning, where do you want your car to "shine" ?? Those 1 7/8" headers will crush a set of 1 3/4" in the upper rpm range (5500-7100rpm). But how many of you guys spent a lot of time in that rpm range ?? But the 1 3/4" header has great low and mid range power........

.

Silverbullet00

pm Anthony at LG Motorsports. That man knows headers!

vettenuts

I found my Tri-Y's kill the 4 to 1 design in the mid range and lose nothing on top. Design is a player as well. It will be interesting to see the new Pfadt design when it is released for the C5.