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I have a 2010 987.2 2.9l.
It has 4 x 400 cell cats ( 2 in each manifold)
I was thinking of removing the secondary cells after the O2 sensors which would leave just one 400 cell cat in each manifold.
The question is how much improvement will I see for a free upgrade vs installing an aftermarkel header with 200 cell cats for $$$

I will also be installing a Borla cat back that I have
 

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Define improvement. Are you looking for more exhaust note, power or both? If you think of the engine as an air pump for a moment you can picture how flow out would be less restrictive, and therefore a small gain. But chasing performance is a balance game. Ideally you want to improve the intake and exhaust commensurately, then one might look at the various tuning software offerings to complement a freer breathing engine. If you're seeking a shove in the back improvement, you're likely to be disappointed, if you're looking to have fun, feel like a personal custom tuner and that's part of your Porsche ownership joy, you're all good. PS Exhaust changes can yield CEL dash warnings. IMO, the headers and sport cats will yield more than simply removing one cat.
 

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I haven't seen the inside of 987.2 mufflers but for reference, here's a photo of a 987.1 muffler I've cut open (prepping for DIY "Carnewal" mod) and also 987.1 Boxster headers and Cayman headers (no idea why they are different). Interestingly I've only just realized there's a bung in my headers positioned before the cat, Think I'll stick a borescope in there this weekend and inspect the condition of the cat, the car has done nearly 150k miles now. I'll also have a look at what the 3 into 1 merge is like.
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The stock exhaust isn't that restrictive on these cars. Even going catless long tube headers and a better catback will get you less than 10HP to the wheels. Its not much of a difference.
I would think that my Soul long tube race catless headers and a Milltec muffler is more like 15 HP. The Softronic flash, race 78 mm throttle body and Plenum certainly pulls it all together nicely. I would guesstimate is about 308HP @ 6700 rpm at the wheels. I did this to improve the flat spot in torque around 4500, which it certainly did. I have had no problems with this system in 4 years of use.
 

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I would think that my Soul long tube race catless headers and a Milltec muffler is more like 15 HP. The Softronic flash, race 78 mm throttle body and Plenum certainly pulls it all together nicely. I would guesstimate is about 308HP @ 6700 rpm at the wheels. I did this to improve the flat spot in torque around 4500, which it certainly did. I have had no problems with this system in 4 years of use.
According to Soul, their catless headers + valved exhaust is worth 9 RWHP. I have their catted headers / valved exhaust setup though fortunately, the previous owner spent the money and not me (wasn't worth a dime in resale, so all good for me). Absolutely not worth the $8500 shipped they want now for this setup, especially since it is just a stainless steel setup. I get Porsche tax but I was paying Vette tax previously and nothing close to these prices for exhaust parts.
 

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I used these mods/parts to improve the cars performance, which they do. So, I really don't want to get my money back from others, just to be competitive in my use of the car. Its just like why I would spend money on Bridgestone RE71RS for 90% street use and 10% track. These tires are worth the extra money to me vs other summer tires. The TireRack's white papers confirms the performance these tires vs 3 other summer tires with useage on a BRZ. Close is the A052, but their wear is much higher.

Some 987,2 S owners mimic the R build and with careful purchase, they do have good resale value.
 

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I have a 981 base and run into this debate with myself all the time. My logical brain/gut tells me the price for the performance is not worth it for a street driven car (no track). But my diseased mod brain constantly thinks about it and would love to do it. I have the cash, just can’t seem to pull the trigger. Still looking for used 200 cell headers to save some money, they are tough to find. For now I am just gonna enjoy the car.
 

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The .2’s have better resale value for various reasons. I’d say confidently it’s the best Cayman S beside the GT4 or R. The R isn’t worth the cash, but it’s a great car.

My headers/exhaust, I got about 20hp gain and that’s with a Malone ecu reflash. They don’t leave a lot on the table for improvement… the only real way on an N/A car is displacement… but unless you need a motor it’s also not worth it..
your best value on these cars for mods is suspension, wheels and tires… even if it’s just springs which isn’t the best option but for 300-400 it’s the most cost effective mod for the money you can do
 

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Ernest,
If you have the money, then sky is the limit. You certainly can install the long tube catted headers and even a Softronic ECU flash, Thats about it for the engine. The suspension can be modified with either a X-71 group that includes swaybars and springs. The other way to go would be adding Ohlin R&T coilovers. The ride is just a little stiffer due to higher spring rates, but they differently improve turn in and weight transfer across the car. The final part would be Tarett GT adjustable sway bars. Then get yourself a set of wide lightweight forged wheels. Many Cayman owners go for 19 " because they fill the wheel well a little better than 18". I perfer the 18", 9" in f and 10" in the rear. Currently using Bridgestone summer performance tires RE71RS in 255/35/18 f and 275/35/18 r size. I lowered the coilovers to about 15 mm lower than OEM. No real downside to this setup except for speed bumps. In canyon driving, this suspension really comes alive.
 
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I would think that my Soul long tube race catless headers and a Milltec muffler is more like 15 HP. The Softronic flash, race 78 mm throttle body and Plenum certainly pulls it all together nicely. I would guesstimate is about 308HP @ 6700 rpm at the wheels. I did this to improve the flat spot in torque around 4500, which it certainly did. I have had no problems with this system in 4 years of use.
What does the exhaust smell like in city driving or do you just track the car?
 

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dibehrns, I use my car mostly for the street and now just a few autocross. The exhaust does have a smell on startup but not when under any load. I use engine braking a lot, but the exhaust is not appearant. I keep the rear deck/window lid closed though so who knows about the actual smell. My wife does suggest on startup there is some smell. Again, this header system gives more power than the cated Soul system. I use a cloth to clean my Milltek exhaust tips. Not much on the cloth with a slight abrasive cleaner, (head light film cleaner). My car does not burn oil as I do not add oil during 4k fill intervals, so some of the exhaust gas residue would be on the tips.
 

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For reference I installed long-tube decat headers in my 2.9L 987.2 Cayman, as well as Cayman R mufflers (I think they are the same as stock mufflers), and got a nice sound out of it but my butt dyno said no real difference. Maybe I should try some intake or soft tune.

Thanks for the cut away on the muffler - I bet cutting the pipe leading into the CAT would do as much as any aftermarket muffler, removing any weight in the muffler will probably improve performance more than the improved breathing.
 

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I run headers and muffler without cats. The car sounds mean and has really come alive. Now, I have also improved the intake side with IPD, GT3 goodies along with a tune. These cars came corked from the factory because the little ol' Cayman cannot out perform the 911. If you have the coin I highly recommend opening the car up to see the full potential.

FYI. The picture above by Apexhunter doesn't show the smaller cat that is in the factory muffler.
 

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I run headers and muffler without cats. The car sounds mean and has really come alive. Now, I have also improved the intake side with IPD, GT3 goodies along with a tune. These cars came corked from the factory because the little ol' Cayman cannot out perform the 911. If you have the coin I highly recommend opening the car up to see the full potential.

FYI. The picture above by Apexhunter doesn't show the smaller cat that is in the factory muffler.
I have the same and wholeheartedly agree.


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