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I was looking to tune the car at a later date and thought going cat bypass was the best for max performance. You feel any seat of the pants improvement?
I was looking to tune the car at a later date and thought going cat bypass was the best for max performance. You feel any seat of the pants improvement?
The turbos spool up faster, maybe hit 500rpm lower than before it seems. You will need to do a tune bc the CEL will come on within 20 miles or so
yes there is. The tune only optimizes it. Spool is driven by the pressure difference between the exhaust before and after the turbine wheel. The cat is placed directly behind the turbine wheel so any reduction in pressure or resistance there allows the turbine wheel to spin up faster. Its like being able to push a car downhill vs pushing uphill
The hard clamp to loosen is the V-band clamp holding the cat to the turbine housings. The band clamp has a 6mm socket head so you need to use a 6mm hex key or tool but there is not enough room for a traditional allen wrench. My bolt head was facing directly up.
Had the same issue with the head facing up, I locked 2 nuts on to the shaft and turned the shaft using these.
I had the same issue with V-clamp. Used some WD-40 and let it sit for 10 mins, and then used a spanner wrench on the tips of the shafts. My shafts had flattened tips, which gave me an idea to use those tips to turn the shafts. It worked just fine. I reversed them for the install to face heads down for easier procedure in the future. Also, I thought about removing the heatshield but instead removed O2 sensors after disconnecting cats, just had to be careful not to tug on the sensor wires when removing cats. Once the cat was free, I could rotate it for better access to the sensors. It was a PITA, but probably saved a little bit of time not having to remove heat shields.
Got a great deal on a lightly used Kline 304 stainless 992 valved and silenced exhaust. Mind you this was for a normal Carrera variant but reading up on the Kline website all the tubular dimensions appeared to be identical between the Carrera version and the Turbo version. I was not enamored with the raspiness of the stock exhaust with the cat deletes - loud but not tonally pleasing to me.
So to remove the stock muffler I had to
1)undo the two clamps (5mm allen head socket)
2)disconnect the PSE valve plugs
3)loosen both cats (undo O2 sensor, remove the 2 mount flange star head bolts, loosen V band clamps) and rotate down to allow muffler to drop out
4)drop out stock muffler
5)transfer valve solenoid motors from stock muffler to Kline. To align the motors to the Kline the valves had to be manually set to the open position and a new Kline spring set in place
6)Kline muffler is designed to slip fit the cats inside its flanges so it gets tricky to align everything back up
After the install I noticed that the tonal quality is much deeper. With valves closed the noise level is about 25% louder than stock. With valves open the sound is tremendous, more similar to a NA car than before. The burbles and pops are less pronounced bc the noise floor is much higher. Unfortunately also there is a moderate+ amount of drone at 2200-2400 RPM which is not going to allow any conversations or BT phone calls. Keep in mind I have Cat Deletes so its going to be the loudest possible combo
I am getting a CEL for exhaust valve stuck or out of range so I need to do a relearn on bank 2 (drivers' side actuator). Overall pleased with the improved sound but for commuting I am going to keep the valves closed lol. For hooning the valves will stay open
04-22-2023, 08:49 AM
