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What's up Guys. Writing this to gain some knowledge from gear heads that are more educated then I am. I probably did all this backwards but available funds played a role in the sequence of my purchases. Below is the order and links to all purchased items. Diablo I3 Tuner- https://www.diablosport.com/intune-i3-performance-tuning/ Throttle Body Spacer- https://www.amazon.com/gp/product/B00IBV4K6A/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 Cold air intake- https://www.amazon.com/gp/product/B00GP8FKGU/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 Performance exhaust- https://www.magnaflow.com/products/12867-performance-muffler-magnaflow-5-round-straight-through-performance-muffler?variant=18434149384307 I started off by tuning it with the performance preset tune that is pre installed on the I-3. There is a total of 3 pre installed tunes based on Octane Level. I believe it was ( Eco, Mid, Performance). I set the Tire size + Soft Shift points. I DID not change the Speed limiter or Throttle Limiter. No other changes that were available were made. At the time is was happy because it basically got rid of the clunk when the transmission would shift at certain times upon quick on and off acceleration moments. Also the throttle response was much better. This was done somewhere around Sep of 2019. Next up was the Throttle body spacer and cold air intake. Both installed at the same time. At this point it turned into a completely different truck. I believe it cut the 0-60 down by about a second. I did notice hearing a higher amount of back pressure in the motor. It didn't seem to be enough for a concern. Also it seemed to not fall into V4 mode as much as in the past. Last was the exhaust, I had it professionally installed, They cut the 3rd Catalytic converter out added 2-1/2 pipe to approximately the same OE muffler location added the muffler a Y pipe and dual 2-1/2 pipes to (cowboy cut tips, Not that this matters). At this point I have to be pretty heavy on the accelerator to take off and its falling into V4 mode constantly. In my opinion exactly opposite when it should be. I went by a performance shop and asked some questions. they want me to pull the diablo tune and do a custom tune (Pay Me). They also mentioned there is an update for the I3 that allows you to turn off the V4 mode. When the guy connected the tuner in the truck after installing the update on the tuner from his shop PC he mentioned that it was asking for a new license purchase. " He couldn't do anything for me." I honestly was in to much of a hurry when I did the tune. I didn't really keep up with what all was going on during installing in the vehicle or even if I registered the product. Lesson learned. At this point I have contacted Diablo Sport via email awaiting a response. Basically just looking for advice on which way to go at this point. I'm currently on the fence about adding a leveling kit and after market rims and tires. Which in my mind would require another tune. Thank you ahead of time for any and all that take the time to respond.

Hello, Everyone Just Wanted to share a video I was meaning to make for some months now, I lost a GoPro Camera on the process, so I had to save for a new one to make this video. If you like the video, a subscription to my YouTube Channel is always appreciated! This is my exhaust set up -Speed Engineering Long Tube Headers (1 7/8" Primaries to 3" Collectors) -Dual 3" X Pipes -Dual 3" Magnaflow Mufflers (PN 14419) - True Dual Exhaust to 3.5" Tips This is how she sounds while towing: Brief Exhaust clips: Thank you all for watching

Hey guys n gals...new to the site. This is my second GM truck but doing a VASTLY different build on her. My first truck is an 05 Colorado Xtreme drift truck, while this one is a 2018 Sierra 1500 Z71 Prerunner build that's my daily (it's the 5.3, not the 6.2) My question is...which exhaust is better for pure, clean loud while maintaining a low, angry tone when I get on it? I know Magnaflow is a straight through so no "restriction" while Flowmaster is baffled for tuned tone. I loathe exhaust "pop n bang" like glasspacks and whatnot...so im trying to avoid sounding like every cheap, clapped out beater truck in my area. I am specifically looking for as low and angry as I can get, but clean and clear. I notice a LOT of trucks here go for the "NASCAR" sounding kits and that's a bit too high pitch for me. I can cut and dump, so I can play with how "loud" it is, but which is best for deep, low, growly sound at all times?