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Hi, I am new to this website and I am relatively new to the car scene. I have a 2004 trailblazer LS, and it has the 4.2 I6. I was wondering, if there are any performance parts out there that could make my trailblazer a little bit more faster? I'm not looking for a supercharger or anything like that, I'm just looking for things to install that could give it just a little bit more power, I know a performance intake could do me some justice but thats all I really know, so if anybody has suggestions I would love to hear them because I have a hard time finding performance parts for my trailblazer. Thank you all.
 

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2004 Trailblazer LS 4x4, 4.2L:, 2016 ATS-V, 2014 CTS-V Wagon, 2018 Audi A7
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I'm relatively new there as well with my '04 I6 Trailblazer. I've read through hundreds of posts and threads and haven't crossed over much in the performance area. I don't think there's much out there for our trucks.
 

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2008 gmc envoy_sle
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hi and welcome, as far as I know, engine wise theirs no real performance parts upgrades availble , I know there is a PCM update that some say makes a difference. I believe they are a sponsor of this site.
 

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I'm relatively new there as well with my '04 I6 Trailblazer. I've read through hundreds of posts and threads and haven't crossed over much in the performance area. I don't think there's much out there for our trucks.
Yeah unfortunately :/
 

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My son had built a modified PCM for the vehicle he gave me - he gave me that and another stock one.

He left most of the emission controls intact, just changed the transmission parameters and the VVT setup with timing and injection mods for a little more performance.

I can say that I've driven it both ways - Stock and Modified ECMs, and the torque on bottom end is maybe twice what it normally is using the mod'd unit.

It loses about 3MPG though - so there's always a trade-off.
 

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2004 Trailblazer LS 4x4, 4.2L:, 2016 ATS-V, 2014 CTS-V Wagon, 2018 Audi A7
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A good trade off. Low end grunt is worth it.
 

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2003 chevy trailblazer_lt_ext
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Cat-back exhaust (Flowmaster/Magnaflow) and a K&N filtercharger will give you a little more pep in your step. The combo will probably add 20-30 HP. These should be the first thing ever done to a vehicle before anything else. Don't even consider a tune without doing these first. Best $500 you'll ever spend on a vehicle.
 

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2008 chevy trailblazer_lt
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I forget which company makes a header and high flow cat for the 4.2L, but it looks great...too bad it's like $1,500 practically! Hard to believe the header and exhaust supposedly adds very little horsepower. I've opened up my air box by getting a junk yard one and cutting on it, and it already had a K&N filter on it, when we got it. I've added a mandrelbendingsolutions.com 3" muffler that is like a Magnaflow, but cheaper stainless steel. I wish I knew what the cam centerlines are and could change the intake cam centerline to about 106 degrees or so, and to add a tune. I am also hoping the 4.10 rear gears I need to get put in, will wake it up some, during towing, compared to the 3.42's I have now.

Rob in AZ
 

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The K&N is an expensive mistake. Since I have both a stock and a modified ECM, and a K&N Cold pack..... and use of a dyno.... I tested both of the air filters.

A net loss of 11 HP with the K&N on my personal 2005 TB. Plus the possibility of fouling the MAF.

K&N is a joke... and this is not the first time I've seen this happen for vehicles with operating emission systems. The computer just sidesteps what you do by looking up a different operating profile.

I ran a dyno shop in Anaheim for 13 years, and NEVER saw any real improvement with their filters. Many times I saw from no- to significant- power profile losses.

Don't waste you money on a fake, highly advertised- nothing but an overly expensive reusable air filter that passes dirt into your engine. I've seen turbos with no clean air-side compression vanes because of the abrasive dirt getting through.
 
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