Parts ordered yesterday and arrived today. Expensive for little pieces of stainless steel, but the expected results will be worth it. I will install them this weekend.

 

As far as I've experienced, the cold start roar should always be there because the car starts with flaps full open for about 20 seconds or so. Then it quiets down. Is yours not that way?

 

Mine is not that way. I will check next time, but I'm fairly certain the valves are closed at start up. Maybe it is dependent on environmental conditions?

 

I thought the flaps were closed on cold start idle but it opens at idle rpms if you turn PSE on. Valves would then close when you be started driving regardless of PSE status then open up around 4k.

 

With PSE off the flaps close as soon as the engine starts to pull a vacuum. They are only open for a fraction of a second on startup.
The cold start cycle is not the valves operating. That’s extra fuelling to get the CAT’s warmed up.
Toggle PSE on and off during a cold start and you’ll understand pretty quickly.

 

 

Its exactly as you stated, but I also have AKRA OAP, so its overall more pronounced.

 

I would suggest far less collar travel than where the video shows. Now more than a quarter inch.. closer to 3/16ths

 

Why would you suggest that? I adjusted them twice and thought it was perfect there (kind of the point no?). Plus the collars hit the nuts, but I”m just repeating myself now…and I have a Kline system now.

 

I set mine up similarly to how yours look in the video, and with AKRA OAPs + Stock back box, I heard a good deal of raspiness (70% open). I moved them up to the nuts, with very little shaft travel (~7/32ths, 90% open)). The nuts are much higher up (less collar travel) than when aligning them with the bottom of the screw shaft. Your position gives the allusion of the flaps closing half way when not engaged in full open… I assume your system sounds clean, since you have the Kline setup (no rasp as partially closed) vs using the OEM back box. Is the nut configuration on the flap valves tighter (closer together) on the Kline valves, not allowing the collars to be seated up higher?

 

My collars are out for delivery and am so happy that I found this thread. Let's hope it delivers the valve solution I've been looking for. Next step will be OAPs but no point in doing those until the valve situation is sorted.

 

I feel the same as you. Going to stop by Ace today and see if they have collars. Otherwise, going to order them from the summit link the other RL'er posted here. I figure the SS is better since I live and drive in a salty climate.

 

i've been very happy with this solution.

i want oaps but price has kept me away so far. my only worry with this solution was whether my so would complain that it's too loud below 4k range. no problems, she hasn't noticed. but i have!

I am now looking at the bmc f1 air filters as an intermediate step to the oaps. intake noise baby

 

Put them on last night and it's the best $16 (because I had to buy 4) I've ever spent on a car mod!

 

Keep your eyes on the classified section, there are usually 1-2 sets of OAP's going fro ~40% less than retail. SOUL/AKRA/Flat 6, and they sell quickly. This will be the second best bang for your buck option when it comes to the exhaust setup.