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Old 04-03-2010, 11:32 AM   #1
SSinthedesert's Avatar
Drives: 2010 Imperial Blue SS
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1 7/8 vs. 1 3/4 LT Headers

I'm having a problem decidine between 1 7/8 and the 1 3/4 LT headers. Does anyone have dyno sheets with the same setup in the car, only changing the size of the headers? Please no "I know a guy who knows a guy" stories. I want to see actual proof. I just have a hard time believing that an 1/8 of an inch warrants the $300-$400 dealers are charging. Show me proof and then I'll believe. Also, I'm sure the size of the cam will make a difference. Will putting a bigger cam make that much of a difference?
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Old 04-03-2010, 11:45 AM   #2
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Here's a great test on header sizes from the same manufacturer done recently by a respected tuner on this site:

Yes, cam will definitely make a big change. For that, here's a good article:

Most of those are pretty radical cams for street driving, though it all depends on your reference. Your best bet is to call 2-3 tuners you see on this site, tell them your current configuration, your goals, what you're willing to spend, etc. and they'll help you work up a configuration including cam that'll get you there. It's all about what you want and what you're willing to spend and that pretty well defines the final configuration.
2010 2SS LS3/M6 Imperial Blue
650HP LPE Package - 576.3 RWHP, 91-tune
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Old 04-03-2010, 12:16 PM   #3
Apex Motorsports
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Whether it's worth it or not totally depends on two things:

1) What are your plans for the car?

2) What is your budget for carrying out those plans?

Last edited by Apex Motorsports; 04-03-2010 at 02:00 PM.
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Old 04-03-2010, 04:05 PM   #4
Search Ninja
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Jannetty showed that the biggest LT's available right now, 2in, showed the most gains. This was throughout the entire bandwidth. The price difference is totally what your budget can afford.
2010 Black 2SS/RS A6
Halltech CF 102 fed
GPI modded intake manifold
Bo (knows) White ported TB
Kooks LT's/ Dynomax VT
Pfadted (springs/sways)
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I once parallel parked a train.
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Old 04-03-2010, 06:06 PM   #5
Russell James

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The 1 7/8s will work perfect for you, now and if you add a cam. I have 1 7/8s ARH on mine and it runs and sounds incredible.
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Old 04-03-2010, 06:21 PM   #6
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I just went through reading and asking tons of questions about headers. Get the 1 7/8! I just ordered my Kooks 1 7/8" LT catted headers a week ago.
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Old 04-03-2010, 08:44 PM   #7

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I got the 2 inchers and they are awesome.
Ordered: 10-13-08
Built: 3-30-09 (#1691)
Recieved: 6-12-09

Blacked out, Cammed (Lunati Voodoo 233/245, .578/.598 @114°, +4°), ARH LTs, VR OTR CAI, Cutouts, and lots of other fun mods.
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Old 04-03-2010, 09:16 PM   #8
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Just some food for thought.... I just ran a 10.99 @ 125 in my L99 and I have the Kooks 1 3/4 headers. The car was also built by Jannetty Racing. So any choice you make will be a good one. Gd Luck!
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