NosLaser

This may seem a bit counterintuitive, but for now I really like the tone of the car with the stock Ti exhaust, but notice the Super Pro's are all 3" with what seems like a slip fit connector where it mates to the cat back.

What are people doing that are still running the stock Ti exhaust with Super Pro headers/X? Am I the only one considering it? Are they just welding a flange on to the LG X pipe I'm assuming?

Next question. Plans for the car are only to take it as far as an Ed Curtis custom ground cam, and possibly a FAST 92mm intake... Is there any real world data to suggest that 1 3/4" primaries would be preferable on that setup, or should I just opt for the 1 7/8"?

Thanks.

neutron82

there is a flange at the back that will bolt up to all of the other 2.5" systems out there, it tapers down from 3" to 2.5"... I would consider the 1 7/8" if you either plan to boost the car or go with a bigger cube motor otherwise 1 3/4" will be fine for h/c/i

lewislgZ06

Neutron is right on the money, as usual. I have LG Pro Long Tubes and mine have the 2 1/2" bolt on flange for any cat back system. I had mine installed at LG, and they recommended the 1 3/4 headers for my H/C/I set up. I have no immediate plans of going SC.
I kept my Ti's on until I stumbled upon a practically new set of GHL bullets from a forum member.
I love the bullets, but I was pretty happy with the sound of the Ti's too, and I believe they flow just as good as any aftermarket cat back systems.
I'm not planning on letting my Ti's go, as I may go back to them some day if I decide to quieten it back down just a little.

0Anthony @ LGMotorsports

1 3/4 are fine and like all of our headers, they are designed to bolt right up to a stock, or stock replacement exhaust. If you saw a slip fit, you might have been looking at a C6 Pro kit as the C6 cars do not have that two bolt flange at the back.

If you are planning on a cam and intake, I would suggest the Pro's over a street series set for sure.

Someone had asked me before about 1 3/4 vs 1 7/8 on a modified car and I have done the comparison. This is a modifed LS2 car so a little bigger displacement. Stock heads and stock intake. Mild cam.














1 3/4 is in Blue and 1 7/8 is in green.
Same car, same dyno, same tune, same cam

Verrückt ZR1

I'm running this exact setup, and it sounds fantastic. The 1-3/4" Super Pros really woke up my '04 Z, and I'm very pleased with the way it sounds and performs now. As stated above, the Super Pros bolted right up to the stock Ti system. No modifications required. If I have the itch to go louder, I may do the Ti bypass mod at some point. Unless you're planning on going FI, I believe the 1-3/4" system should be just fine.

neutron82

not bad, they picked up power everywhere... I bought my 1 3/4 superpros probably close to 6 years ago and I don't believe you offered the 1 7/8 at that time otherwise I would have probably went that route, I'm sure I would benefit from them now... but after a new set and coating, adding wideband bungs, etc, I don’t know if it would be cost effective... if I were to do it over again I would have started with the 1 7/8 in my case

NosLaser

Awesome replies guys, and I think this makes my decision.

Anthony, I think you are right, as the super pro video is of the C6 version if I remember correctly, so that must have been where my confusion was.

Looks like LG 1 3/4" super pros it is.

MX621

If your keeping stock heads don't bother with a fast manifold. Just a good way to blow a grand on 5 hp.

NosLaser

Yeah? I was wondering that.

lewislgZ06

I would however do a good CAI with the headers and cam, and of course a good dyno tune. I like my LG cam too, btw.

NosLaser

Okay cool, yeah the car currently has a vararam V2 on it which I am happy with.

With just the vararam and nitto DR's on stock wheels, the car went 12.26 at 114.43 with a pretty badly slipping clutch on my first and only pass in the car (I parked it immediately after due to the clutch.) Not too shabby for a stock '01 in my opinion.

I installed a centerforce DFX in the car, and am actually taking it to the track tonight to put this thing in the 11's.

NosLaser

Track was packed so I was only able to manage one pass (seems to be a theme with this car) and it was also a cold night, so wheel spin was a very large factor. 11's were not in the cards, but the car did trap almost 117 (116.6) which I felt was pretty damn healthy for a CAI/DR '01.

My 60' was a 2.00 on a 12.35 ET, previously I did a 1.87 on a 12.26 ET, so if I can even match that 60' the car should be solidly in the 11's. I love these things!

NosLaser

Apologize, one last question. I do think I want to go with LG headers for their reputation...but on a cam-only Z06, what would the real world dyno difference be between the Super Pros and their standard headers? Just trying to see if the extra $ could be better invested elsewhere for my goals. Thanks.

493lszosix

I'm running the street series with the 2 1/2 midpipes with heads, cam, fast 102 and don't think I'm giving up too much hp vs the pro's, also running corsa xtreme and it's only 2 1/2 also, if wanted to run a 3" all the way out the back then I would prob go with the pro's but your probably only looking at a 3-5 hp difference between the two

As for the fast I picked up 33 rwhp over the ls6 intake with just cam, headers and stock heads but this was the 102 version spinning 7000, if just a street car probably not worth it because it's all at high rpm but if you decide to do heads later it's a good investment

0Anthony @ LGMotorsports

It has been a while since we did back to back to back runs on the same car, same day switching them around.

If I remember right on a bone stock car there was no more than 2-5 hp difference and any changes were above 5000 RPM. Most of that is going to be due to the merge collector and the X pipe design.

Now as you increase flow through the engine, be it a cam or heads or what ever the changes will start to grow. That isn't to say you couldn't make 450-470 rwhp with the Street Series, but you might be giving up 10-15 hp by doing so.

493lszosix

I have the Street Series as well as your G5x2 cam with tfs heads and am at 493 rwhp now, do you think the Pro's would give me a solid 10 hp over the streets, even if it was above the 5000 rpm you stated it might still benefit me because I usually shift around 7100, I just swapped in the x3 cam and thought about bumping up the compression a little more wouldn't mind to be around 510-515

it would be interesting to know the hp difference between the two on a heads/cam car because many use the LG headers, LG makes good stuff!

0Anthony @ LGMotorsports

I honestly think it would pick up some with the 1 3/4 Pro's. I think you would benefit from doing that along with a 3" axle back too. I don't know if I would swap to 1 7/8 just yet...but it would be border line. Only draw back from where you are now, I think it would loose power under 3k with the 1 7/8