The varex dont rattle, they have more issues with The electronic control unit malfunctioning more so than any actual exhaust issues.

Well thats the case here

 

Cant believe for that small amout the whole muffler costs, the mechanical system will last their whole life, issues are inevitable...

Exhaust gases are agressive and the condensed waters in there also, they will kill thin or brittle parts as u count 1-2-3

Greetz
Ron

 

V2 headers and exhaust arrived from Swain Tech today. I just finished painting them with VHT SP106 (flat silver) to fill in the rough surface of the ceramic coating. That will make them easier to clean in the future. Should have them on the car by the end of this weekend.

 

I hope VHT works better for you it bubbled first start for me

 

I appreciate the well-wishes. VHT bubbling is a sign that the curing process wasn't complete. I think I'll be fine--I started the cure with a heat gun and I'll finish it on the car with conservatively short heat intervals in the beginning.

 

Any updates
I'm planning on buying headers in the next 2 months

 

I wonder at what power level it would be benificial to go from 1 7/8 to 2”?

 

Jannetty Racing did a test on an LS3 about 8 years ago. He worked with ARE to get 1.75" , 1.875" , and 2" headers to do back to back dyno testing. Even at 400rwhp the 2" primaries showed more peak and average hp and tq, but only by a few. So they make more, but only a little even at 400. I believe he also says around 700rwhp is where he recommends the 2" primaries.

 

I had 1 3/4 and switched over to 1 7/8 but to be honest to 1 3/4 felt better than the 1 7/8I approached ARH in regards to doing some step Headers and it seems that this would be a custom $$$$ job

 

Thanks for the info. This sounds like something that would be even more beneficial to a blower car than an NA car. Gotta get the air in and out! My goal is to get a set of AFR heads on it sometime this year and then the 2" headers and full 3" exhaust. Stock heads and 2.5" catback are my bottle neck right now I suspect.

I'm in the process of building the exhaust right now. My mufflers should be here this week and if the weather cooperates I might be able to get some stuff done. I've got 20' of 3" 304 stainless in the garage floor as well as 3" stainless sockets to mate to the headers. I'll have a Dynomax ultra flow X where the factory resonator is and then Dynomax race bullets with a 3.5" inlet and 4" outlet. I'll step up the pipe right before the bullet and then I'll have 5" tip on the end like the Borla catback system. I'm getting pretty anxious to get started on it. If all goes well I'll have less than $500 in a full 3" stainless exhaust built to how I want it.

 

Unless you put an exhaust back pressure gauge on your exhaust dont assume.

I ran them all, stock, 3" all the way back, partial 3" with open 2.5" and now 2.5" catback with stock v2 mufflers.

You wanna hear the best part, 1 7/8 headers with 3" collector and 3" Kook cats connected to 2.5" piping all the way back with open mufflers, gave me the most bottom end power with only 5-10hp loss at the top. I have it where i may switch from an open muffler to stock mufflers in less than 30mins, so i am not too worried.

Dont be fooled, UNLESS YOU ARE PUSHING MORE THAN 3PSI OF BACK PRESSURE YOU ARE NOT LOSING ANY HP/TORQUE ON A NA.

Boosted is different.

I had upto 15psi of backpressure and dialed it down and yes there is a fine line between right amount and too much back pressure....

 

I'll have an MP122H pushing roughly 14psi through it. I'll know more once it gets on the dyno. Right now my exhaust constists of 1 7/8" Kooks with the stock cat back except for some flowmasters and 4" tips so I KNOW my exhaust will be a bottle neck. There is no assumption about it. I don't care what the car makes down low. I've got plenty of blower to take care of that.

 

You are about 550 at the wheels?

What cats you runnin?

In all fairness I would say that we are pretty much equal and what I do to my system should be similar to what you do to yours

 

If I'm not at or over 600 at the wheels I wont be very happy. Everything I have seen with a similar setup has been 600-650rwhp. No cats, forged LS6, blower cam, Crane gold 1.8 roller rockers, 4" intake with card MAF, ported TB and inlet, spinning this 122 to 18K at 6500 rpm. AFR heads to come later this summer and possible meth but I'm not a big fan of spraying pre blower. I've seen a lot of stripped rotors because of the meth. I think spraying back farther from the inlet and letting the liquid have time to evaporate a little more before it hits the rotors would help that but I cant decide if I want to try it. I know for sure it would help my intake temps though.

 

Ok, you dont wanna spray before rotors but after.

You will need to get a nitros spacer plate modify it for meth and install under the blower.

You will be between 550-600

Exhaust wise you may want to go half way and get a 2 3/4" pipe,

 

What are the specs on your engine build again Naf?

 

415ci
Stroked ls3 with ported ls9 heads, gt1-1 cam and 12.5:1 cr

 

I knew it was a pretty stout build but I couldn’t remember what all you had done.

 

I didnt bore you with ported 102mm intake and 102 tb , 102 ma,f cf intake tube, and dry sump system

 

Agreed. With the blower, you don't need to really worry about scavenging, reversion, etc.

Regarding backpressure, I wish people would talk more about wave reversion and flow velocity. Backpressure is bad, period.

I think your setup will be really cool, and I look forward to the pics!