NelsonF

This is definitely an option for my 981 Spyder if the upcoming version disappoints. It definitely improves the power/weight ratio!

ajw45

+ 200lbs!

.2 GT3 - 3288lbs with 18 ways, bose, lift, extended tank, leds, and pccbs : https://rennlist.com/forums/991-gt3-...ld-weight.html
GT4 - 3084 with pccbs, lwbs, pdls, extended tank, junk in the trunk, and spp

twospyders

I recently purchased a GT4 and a 2018 manual GT3. Which car will benefit more from the Dundon headers and tune? Which should I do first?

Jamie@dundonmotorsports

Hmmm there’s a lot to consider here. I’ll PM my phone number and we can discuss...

KOTYKB

I'd like to join a group of friends at Laguna Seca in a few weeks but with my Dundon headers its way too loud. My friends in GT3's that have a bypass just lift where the microphone is but I'd likely need to do that while having the exhaust shut. Is there a way to deactivate the exhaust valve which would help limit the dB's with my car?

user1029

Definitely the GT4, in fact sell the GT3 and use that money and convert the GT4 to 4.5L

Jamie@dundonmotorsports

You need an Alekshop GPS valve closing device, and you will still likely have to lift. Another option is to add a GT3 Quiet Muffler, but that's more money...

KOTYKB

Thanks for the quick response Jamie! It looks like I'll need to sit this one out unfortunately but there are still events at Buttonwillow and Autoclub in the coming weeks : )

Jamie@dundonmotorsports

those are fire at will tracks, so go have fun!

KOTYKB

KOTYKB

Snowy999

Sounds awesome and nice driving !

nocospeed73

Great post- thanks for providing data and experience.

nocospeed73

Reviving this post. I am wanting to head down the header path but have a few questions that I am hoping someone can help with:
-I have heard running without CATs can cause yellowing of the back of the car (at least according to Obsessed Garage). Anyone found this to be true? Any way to keep this from happening- maybe PPF the rear?
-If I don't go full catless, maybe the Dundon catted system where you run them further down the line. The problem is it becomes a fairly expensive system. Anyone put this on and tried it out? Pros/cons?
-FVD Brombacher also makes a 100 cell CAT system that has them closer to the muffler. Kind of an interesting system but also expensive.

Maybe I am making too big of a deal. Talk me down from the ledge!

d00d

Any soot deposited isn't permanent.
Use Simple Green, it works very well without a lot of scrubbing.
I don't remember if I've had to use it after PPF was applied.