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Took the time today to jack her back up and correct my original mistake in attaching the muffler mounting plate. For the record, the correct orientation is for the upper tabs to tuck behind the plate that mounts to the transmission and for the lower portion to sit on top or in front of that transmission plate. This effectively corrected for my downwards angled tips and they are now level and true. Still think the 100mm are a bit too long but overall much better.
i was able to support the muffler and axle pipes with jack stands. Remove the muffler straps which effectively freed the muffler from the mounting plate, unbolt the mounting plate from the transmission mount and reposition without having to drop the entire muffler or disconnecting the side pipes.
Deeper and ‘throatier’ Per the wife who rode in it for the first time last night. Definitely louder than stock with race headers and the valves closed. Not sure that it’s any louder than having them open though. I like it
Deeper and ‘throatier’ Per the wife who rode in it for the first time last night. Definitely louder than stock with race headers and the valves closed. Not sure that it’s any louder than having them open though. I like it
wife knows the definition of throatier? Red flag? Uh Keeper
good to know it’s not crazy loud. Still waiting for that box from Dundon... any day now Jamie
Last edited by Five12Free; 03-25-2019 at 03:05 PM.
Anyone have the dimensions (length) of the stock 991.2 gt3 tips? I keep hearing that they are a good fit for the GT4 conversion but would like to know specifically how long they are.
Anyone have the dimensions (length) of the stock 991.2 gt3 tips? I keep hearing that they are a good fit for the GT4 conversion but would like to know specifically how long they are.
I have the Dundon tips which I believe are 88mm. I will take a pic and measure them for you in a couple of hours when I am back home.
Anyone have the dimensions (length) of the stock 991.2 gt3 tips? I keep hearing that they are a good fit for the GT4 conversion but would like to know specifically how long they are.
Here are pictures of the Dundon tips. 88mm to the bottom, 110mm to the top.
Quiet. The muffler is awesome and does a great job keeping the car quiet at WOT. The issue as with all catless GT3 muffler conversions is they drone down low and very boomy (under 2000rpm). Noone with cats have complained about this so hoping this should fix it.
If you drive the car at 2500rpm+ then there is no issues and you could cruise at 3500rpm more than comfortably.
My wife isn't a car person, and has been in the GT4 probably less than 10 times in the 3 years I have had it so not a good guide of how bearable it is but she did pick up the difference. She never complained about the race headers previously (non Dundon).
No O2 sensors past the cats... only the ones on the headers
Originally Posted by Charliekay
Quiet. The muffler is awesome and does a great job keeping the car quiet at WOT. The issue as with all catless GT3 muffler conversions is they drone down low and very boomy (under 2000rpm). Noone with cats have complained about this so hoping this should fix it.
If you drive the car at 2500rpm+ then there is no issues and you could cruise at 3500rpm more than comfortably.
My wife isn't a car person, and has been in the GT4 probably less than 10 times in the 3 years I have had it so not a good guide of how bearable it is but she did pick up the difference. She never complained about the race headers previously (non Dundon).
Your cats are getting welded up Charlie, should be ready to ship by the end of the week.
03-24-2019, 01:11 AM
