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  1. 02 Bravada sounds like Diesel

    OEM Issues
    My vortec 4.2 sounds rough. I have no issues with mileage (still getting 20 mpg highway), no error codes for the engine itself, idles smoothly, new belt and tensioner. Issues: *232,000 miles small oil leak (probably valve cover gasket) Code P420: My CAT is bad as revealed by O2 sensors...
  2. Anyone weigh the old muffler when they removed it?

    Exhaust Mods
    So I was looking up the original weight for the stock OEM muffler and it is 24lbs. so I was curious how much carbon build up there is after 13 years, so I plan on weighing the old muffler after I remove it. And I will keep you posted of when I do it and what I will replace it it with.
  3. Weird Whining Noise From Engine

    OEM Issues
    Hi! I own a 2005 Chevy Trailblazer LT with the 4.2 L I6 engine. Ever since I bought the car it has a whining noise (kinda like a hum. It's hard to explain but it doesn't sound like a belt screech) that I can't quite pin down to a specific area. I hear the same type of whining from other...
  4. Possible Side exit exhaust?

    Exhaust Mods
    Due to years of weathering I recently found a hole in my exhaust near my rear door and was wondering if anybody had done a side exit exhaust. I was think of cutting where the hole is and using an angled piece of exhaust pipe and basically removing the muffler and having the exhaust come out the...
  5. Parts Needed for Exhaust on '05 TB-EXT

    The "How-To" and DIY Section
    2005 Trailblazer EXT, 4.2L straight 6: I'm in the middle of replacing my transmission oil cooler lines, but that's another story. Anyway, I had to cut one of the two studs that connect the catalytic converter to the tailpipe/muffler flange and I broke the other one. (I could NOT get the new...
  6. Best / cheapest way to get rid of cats and still pass inspection

    Exhaust Mods
    I have an 07 tbss with magnaflow muffler and resonator delete..I'd like to get rid of the cats and eventually put a set of kooks longtube headers on..what's the best way to get rid of the cats and keep it street legal..I know about mil eliminators but haven't found any for my tbss..any suggestions?
  7. any ideas on making a 4.2 sound better?

    Show and Shine
    I have a traiblazer with a 4.2 inline, and I want to make it sound better. It is almost silent right now with the stock exhaust. :sleepy: I wanna hear the thing! The problem is, six cylinder engines can sound like tuners depending on what is done to them. I am looking for a more rumble...
  8. Exhaust

    Exhaust Mods
    I am stuck with the stock exhaust right now and am looking towards getting an aftermarket muffler such as a flowmaster or borla. I am a teenager and do not get paid much so i cant afford a full exhaust. I do not mind sound, in fact id like to have it fairly loud just not too loud to where I have...
  9. Drone from hades.

    Exhaust Mods
    The dreaded drone has come to bite me. I have the 03 i6 blazer with a series 10 flow master dueled into echo tips. Amazing gain in mpg and power but now I have a little one coming and my wife is not wanting to put ear muffs on the baby every time we take the blazer. I know I'll probably have to...
  10. Possible exhaust manifold leak?

    OEM Issues
    I have researched many threads on this issue but im still not 100% sure maybe you guys can help? Model: 2002 Chevy Trailblazer LS 4wd 4.2L Symptoms: 1. Sounds like a tractor on startup, then sound disappears once it warms up 2. Slight odor of exhaust coming from inside the cabin (air...
  11. [SOLVED] 06 Denali Transmission Pan

    The 02-09 "How-To" and DIY Section
    I'm trying to change my transmission fluid/filter on 06 envoy denali but having a heck of a time dropping the pan. The exhaust pipe is right below the back end of the pan and doesn't appear to be enough clearance to get the pan out. Do I really need to drop my entire exhaust to get this pan...
  12. Seafoam issue will crank wont idle

    OEM Issues
    Hey guys I have an 06 ls 4.2l v6 that just passed 100k. I have my smog check coming up so I decided to give it a simple tune up. Car has been running fine so today I cleaned the TB entirely, swapped out all new spark plugs (disconnected battery throughout all this), cleaned and oiled K&N filter...
  13. Rattle after deceleration

    Exhaust Mods
    My first post.:) I'm really happy that I read the forum. Great and informative. Love it. Learning a lot. Okay I have a noise coming from the bottom of my 2006 SAAB 9-7x 5.3i. When I decelerate there is a rattle under my car near the middle of the car. I have been to the dealership. They have...
  14. oil and possibly white smoke out exhaust

    OEM Issues
    I am not new to the site, but have used it to fix small issues with my 04 Trailblazer. I want to thank everyone for their posts. I do have a issue with my trailblazer and i am hoping that someone can point me to the right thread or maybe say what needs to be looked at fixed. 1. On vehicle...
  15. Exhaust Manifold help

    OEM Issues
    Hey trailvoy family! I have a cracked exhaust manifold on my 2002 Olds Bravada and I would like it change it out myself if it is not too hard. Has anyone done this already or has an instructional walk through that could help me out? Thanks guys
  16. [SOLVED] Exhaust manifold head studs (Already searched)

    Exhaust Mods
    Searched and Searched but no answer. I have to replace my exhaust manifold on my I6 but i need to find the specs on the studs so i can replace them also. They are in need of replacement. BTW i have a dorman manifold which i bought from Autozone with lifetime warranty, the manifold cracked...
  17. turbo exhaust manifold

    Engine Tunes/Mods
    does anyone sell a turbo exhaust manifold for the 4.3L I6? or is this something that id have to fabricate myself. im wanting to run a decent sized turbo and run about 5 lbs of boost daily. ya know, make it fun to drive. so if anyone knows of a website that sells a turbo exhaust manifold for the...
  18. PICS! Martin's TB

    TrailBlazer / Envoy Chat
    Hey guys, Just here to show you some pics of my tb. Mods/Accessories: -Sirius Satellite Radio, purchased in 2007 with a lifetime subscription. -20'' Dale Earnhardt American Racing Wheels. -Custom Exhaust, 3' pipe 4' tip. -8000K HIDs. -Quad Headlights. -Blue LED Reverse and Front Interior...
  19. VIDEO of my mods to date

    Pictures and Videos Also check out my gallery for pics. The Zaino is amazing stuff!! :cool:
  20. Help with Flowmaster 50 series

    Exhaust Mods
    Hi, i have an 09 Saab 9-7x 4.2 i6, with a K&N intake. I am looking to make my saab louder. I have been reading up on the mufflers and have narrowed it down to the flowmaster 50 series, but i was wondering if someone could tell me exactly what one to pick, the stock muffler is a center in/...