Originally Posted by PAJ

I used my iPhone with case as a spacer between the collar and valve actuator thingy. Sorry I don't have a more exact response! I'm currently in a hotel room and do not have access to a measuring device.

Originally Posted by UncleDude

Ok LOL, well you gotta use something!…. I am guessing you have them more open then than my mock up a few pages back. I might try to put mine on Sunday - I really miss it.

Originally Posted by IL_Pete

Hey BoxKing!

I ran just the Kline Inconel Exhaust + OAPs for a few months on my PDK GT4 last year. I liked that setup a lot with the GT4, next to zero drone or boominess, as everyone reports here. For a Cayman I think the Kline is the way to go. The Boxster/Spyder are less prone to drone/boominess than the Caymans, so other combinations work okay with those, as I have documented on my Exhaust thread, but I would only go Kline on a Cayman.

It was good on the GT4, but I felt it wasn't quite loud enough, so I did add headers later last year, along with the M-Engineering tune so I could turn off the Cold Start. (The Cold Start was pretty loud with the Headers. I only recommend that if you hate your neighbors and don't care if they hate you.)

I did Soul Street Headers. The only reason I didn't go Kline Inconel is because Eric (who is awesome!) didn't have them in stock, and the wait was 6-8 weeks. I didn't feel like waiting, and Soul had them in stock, and I caught them just before a price increase, they were a good deal.

Good lord! That full setup with the Tune was OUTRAGEOUS! In a good way, it was amazing. My 19 year old son, who is also into cars, said it was probably the best sounding exhaust he had ever heard in real life.

It is not for the meek. With valves open all the time, at full throttle and full RPM, it is very loud and can likely be heard for miles. It sounds so darn good, like a demon has been awakened from the depths of hell. If you like that sort of thing. If you light it up at full volume with law enforcement around, I predict a 90% chance of getting pulled over. (Knock on wood, no such issues so far for me.)

It is still very manageable from a Jeckyll and Hyde perspective, with the valves open all the time it isn't too loud with RPMs under 3800, and not on heavy throttle. So you can really manage it with what gear you are in and your throttle input. The beauty of that is that in lower RPMs and lower throttle levels it sounds really great like that still, unlike before the Headers - that is exactly where I felt that just the Kline Exhaust and OAPs were too tame, at lower RPMs and lower throttle. It really makes the car really fun to drive ALL THE TIME - even when you are just tooling around town and short shifting.

The increase in power of the OAPs and Tune was very significant. PDK Launch Control Launches became insanely fun! You could not help but laugh hysterically out loud, especially if someone else was with you. I only tracked it twice with this setup (because I bought a dedicated track car over the winter), but it felt faster, posted good lap times despite it being early in the season (with my technique being pretty rusty), and sounded amazing.

No CELs whatsoever for me, for the few months I ran it that way.

One nuance/minor issue that wasn't a showstopper for me - with the valves closed all the time, there was actually an increase in drone/boominess that is not at all there with just the Kline Exhaust and OAPs. That sort of makes sense, you have this significantly increased sound and airflow, and your are trying to bottle it up. I only used the valves closed when leaving the neighborhood early in the morning, or in the presence of law enforcement, or for some other reason wanting the outside to be as quiet as possible temporarily. Other than that I just left the valves open and kept it below 3800 RPMs and staying out of heavy throttle when trying not to be too loud. The interior sound was a little unpleasant in that Valves always closed configuration, whereas with just the Kline Exhaust and OAPs, it is not at all so, it is just very quiet, too much so for my tastes.

I plan to do that same full exhaust setup again with the incoming GT4 Manual. The upshifts with the PDF sounded epic with that setup, I look forward to hearing how an aggressive rev-matched downshift sounds with the Manual!

Originally Posted by BoxKing

Ohhh, Im running the Inconel system (OAP+REAR + Full open PSE) for the last couple of months, and Im absolutely in love with this setup! I feel like the system hit the full break in period as of yesterday, bc the tone seems to have gotten even better over night. At this point, its not a matter of if I will be getting the headers/tune, its when - right now I plan to get them over the Fall/Winter months, but I said I wouldnt buy the Kline system until end of this year, and one email to Eric, and I had the box full of pipes the very next morning… so, I’ll most likely get them sooner given my track record!

Question: I have done all of my exhaust installs on my own. With this said, should I have any concern doing the headers as a DYI, or is this an install best left for an Indy shop? Price does play a roll in my decision, as I’d most likely hand these off to a shop if the price was around $300 for the install.

Originally Posted by MaddMike

I did my own headers and it took an afternoon with a Quick Jack. Make sure you pre-purchase the triple square socket set as it will be needed to remove the headers from the block.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I have no idea what a shop may charge. However, the headers are totally worth it and give it both that wail and a faster swinging tach as well as a few hp I'm sure.

Originally Posted by justince

Really considering picking this up, but a bit hesitant to do any power related mods since the 6mt cars are torque limited cause this gearbox was initially designed for the 2.7/3.4 in the 981. I guess if you skipped headers the power gains will be marginal. Obviously looking longer term, but yeah....got some thinking to do.

Originally Posted by UncleDude

That would be the thinnest of reasons not to do this upgrade. It is the best one you’ll do - promise.

Originally Posted by justince

Really considering picking this up, but a bit hesitant to do any power related mods since the 6mt cars are torque limited cause this gearbox was initially designed for the 2.7/3.4 in the 981. I guess if you skipped headers the power gains will be marginal. Obviously looking longer term, but yeah....got some thinking to do.

Originally Posted by justince

Is it really? I don't plan on keeping this car for a few years and passing it on. There's no long term data on this & a gearbox failure 30-40k miles down the road won't be fun.

If it were just the clutch or something I'd live with it, but given the 3rd gear fiasco with the 981 gt4 I'm worried that the actual box as a whole is already kind of at it's limit.

Originally Posted by justince

Really considering picking this up, but a bit hesitant to do any power related mods since the 6mt cars are torque limited cause this gearbox was initially designed for the 2.7/3.4 in the 981. I guess if you skipped headers the power gains will be marginal. Obviously looking longer term, but yeah....got some thinking to do.

Originally Posted by dmboone25

I have the OAPs and rear section in inconel, and I would say that (for me, anyway), there wasn't a noticeable difference in the overall power of the Spyder after the install. Coming from BMW turbo land, where piggybacks really move the needle, changing out the exhaust didn't really register on the butt dyno.

This is for aural pleasure only, and the Kline system is definitely an upgrade on that front.

Originally Posted by UncleDude

It is IMO. If you think the manufacturer puts out a transmission that can't handle 1% more torque (or whatever minuscule amount it is) then yes I think that's looking for reasons not to get it (which is fine!). These things, IMO, have big time redundancies, that's what adds to the durability.