View Poll Results: 1 3/4" Headers or 1 7/8" Headers ?
1 3/4" Headers
42
37.50%
1 7/8" Headers
70
62.50%
Voters: 112. You may not vote on this poll
1 3/4" Headers vs 1 7/8" Headers ?!?!?
Thread Starter
Staging Lane
Joined: Jun 2008
Posts: 60
Likes: 0
1 3/4" Headers vs 1 7/8" Headers ?!?!? I have searched and read numerous threads and still havent been able to come up with a answer... on a 98 z28 A4 with basic mods for now (Throttlebody, Lid, Exhaust, ls6 manifold) should i go 1 3/4" headers or 1 7/8" headers (what will make those most power in other words)? if so which brand to go with ? i got $500 to spend and ill be doing a MS4 cam or something like it here in about 8 or 9 months along with a set of heads. So im going for a very aggresive DD setup.
Tech Resident
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
An MS4 is nothing close to what you need to warrant bigger primaries. Unless you're going stroker or FI/NO2, stick with the appropriate 1 3/4" headers. Putting larger diameter primaries on your car will just slow down exhaust velocity and create more drag on the exhaust cutting big power in the low/midrange RPM's.
We recently did a dyno comparison between some 1 3/4" Headers and our new 1 7/8". We found some great results supporting the 1 7/8 headers doing well. You should see basically the same pick up in power until about 4800 rpm where the 1 7/8 header starts to make more power. Here is the thread where we poste our results for that comparison.
https://ls1tech.com/forums/showthrea...ight=7/8+1+tsp
https://ls1tech.com/forums/showthrea...ight=7/8+1+tsp
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FYI - listen most to people who have some dyno feedback on both products
listen most to people that actually have the products you are looking at
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Ahh, then you're pretty much stuck with Pacesetters or Texas Speed, or used. Your decision is made for you, price-driven. Any long tubes will be a noticeable improvement, especially with a tune. No downside at all.
Thread Starter
Staging Lane
Joined: Jun 2008
Posts: 60
Likes: 0
Yeah im stuck between Pacesetters 1 3/4", Texas speeds 1 7/8", Eledbrocks 1 3/4" stepped to 1 7/8" or LLP's Stainless steel headers...
An MS4 is nothing close to what you need to warrant bigger primaries. Unless you're going stroker or FI/NO2, stick with the appropriate 1 3/4" headers. Putting larger diameter primaries on your car will just slow down exhaust velocity and create more drag on the exhaust cutting big power in the low/midrange RPM's.
He can't resist a header thread anymore than a crackhead can a rock At least he didn't QTP
this time He is the Patrick G of headers
im going to be ordering this friday or saturday so i need to make up my mind soon 
Tech Resident
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
We all understand 1 3/4 headers are "optimal" for a h/c/i/ 346 set up. There is way more important things to a combo in my opinion than if you run 1 3/4 or 1 7/8 headers. We are talking minimal differences. A cam on the other hand can make or break a car but picking between 1 3/4 or 1 7/8 is not going to. If you dont plan on going bigger buy 1 3/4 if you want room and have plans to grow buy 1 7/8. Thats just my .02
11 Second Club
Joined: Dec 2007
Posts: 868
Likes: 0
From: Charleston, SC
+1 with that kind of budget your really limited on which headers are best but the TSP 1 7/8 wouldnt be a bad choice to look at