gmc aftermarket exhaust

i've got a 2003 gmc sierra extended cab and am looking at putting on different exhast. i want something simple. anybody got any ideas? i was thinking about putting on a flowmaster muffler. what other mufflers have some of you put on your trucks? what type of muffler (model) have you used? any help would be appreciated. thanks.

shaun farmer

flowmaster makes the cab loud as hell, i would definitely get a cherrybomb.

a borla cat back system is nice or a gale bank exhaust is really nice but pricey. if you go with a flowmaster it will have the drone at certain rpms inside the cab that will make you nuts.

Check into a Magnaflow. I'm thinking about getting one for my husbands truck. From what I've read, it won't make the noise inside loud like other mufflers, but you will get the deep rumble outside that most people are looking for.

i've got a 2003 gmc sierra extended cab and am looking at putting on different exhast. i want something simple. anybody got any ideas? i was thinking about putting on a flowmaster muffler. what other mufflers have some of you put on your trucks? what type of muffler (model) have you used? any help would be appreciated. thanks.

shaun farmer
I am also looking for exhaust for my 93 Sierra, but I have a reg cab and short bed (sportside). I was looking at the Gibson, but they say the one I want is only for the 5.7liter, mine is a 5.0. Anyone know the difference in the fittings behid the cat converter? I want either the super trap that exits infront of the rear tire or the single to dual. They are both about 300.

I was thinking about measuring the muffler, buying an afterburner or something that will fit and going to midas and having them fab up some pipes, this might be the most inexpensive. dunno.

Gio :sly:

I put the single outlet Gibson cat back on my 2003 4.8 and I'm very pleased. Not too loud in the cab and just right outside.

I'm shopping, too. The Gibson systems are nice and priced best through www.summitracing.com. I'm looking on the economy side. www.jcwhitney.com has a variety of less expensive cat-backs, as low as $169.99 that I'm inclined to go with.

I 've had my truck ('96 K1500 ext. cab w/ 5.7l) a week and I already want to dump the whole exhaust. Chevy small block manifolds are restrictive on any motor, the y-pipe is the factory's attempt at a joke, and the rest isn't much better either. I like Edelbrock's TES setup, but haven't heard much in the way of feedback from any 4-wheelers. I drive on-road 90% of the time but I still want good torque the few times I'm off-road.

BTW, Flowmaster has several different types of mufflers. In general, steer clear of any 2-chamber models as they are LOUD :eek7: :uhoh: :nono:- the 3-chamber models (especially the improved delta series) are better suited for us truck types.

Geno

I have a 2004 Sierra Crew Cab 2500 short box with Quadrasteer. Does anyone know of an aftermarket exhaust that fits a Light Duty 2500? This is the first year GM has offered this truck so I don't even know if there is a system out there. I guess the similar truck from last year was the 1500 HD Crew cab truck....but in 2004 they dont offer the 1500 HD Crew Cab anymore. Would a cat back for a 2003 1500 HD Crew cab fit a 2004 2500 LD? Both trucks come with the 6.0L engine.

Any help would be appeciated.

Thanks
JUstick

I have a 2000 Sierra also, running dual out Magnaflow exhaust...Sounds great, not much cab noise which is also a plus. Has a great tone outside, and inside on accelerations. Improved performance, but mileage isn't that great, i just tend to push it harder/louder. I recommend Magnaflow exhaust.

I ended up going with the Gibson cat-back "Super-Truck" system. It exits in front of the rear wheels and is pretty loud. This system was easy to install, since it doesn't go over the axle.

I found the best pricing on this system through Proficient Performance (http://www.proficientperformance.com)

spf8298, take a look at Gibson Exhaust (http://www.gibsonperformance.com) for your application. They offer both stainless steel and aluminized systems with a variety of exit locations. I noticed that the exhaust on my 03 was 2 3/4" diameter and no one offers exhaust components in this size. The Gibson system is 3" between the cat and muffler.

I have a 96 gmc sierra with a 5.7, I just installed a flowmaster 3 chamber duel in , duel out, it is very loud in the cab, outside sounds good. It's been on for a week and I am having it taken off, I Am thinking about a magnaflow, anyone have any info on the magnaflow, I need to cut down the interior noise in half.
Thanks!

I have a 91 full size LB, and have the magnaflow, I personaly like it, though the shop felt I could get better performance from the flowmaster"delta".
but because of past experience noise levels w/other exaust I opted for the magna flow.
just a personal pref, I guess.

Last week I had a V-Force muffler installed on my 2000 GMC Sierra Z-71 X-Cab. The drone inside the cab was so bad at 1800 rpm, I had it taken off and put on a larger muffler with baffles. Sadly, the nice rumble is gone along with the drone.
The V-force is kind of a knock-off of the Flowmaster, so it's no surprise that the same results are being reported With Flowmasters. My system is a single pipe in from the Y and two pipes out into straight 3" extensions. I talked to the people at Flowmaster and they said they have a lot of complaints about cab noise on the GM X-cab trucks. They recommend their new 70 series muffler as a better choice, not necessarily a cure ( about $150)

I have a 99' Silverado Z71 and my buddy has a 99' Sierra (Same truck w/different Badge) and it seems people are not happy with the Flowmaster systems.... I installed A Cat-back 20 series system on my truck and Couldn't be happier, I get hardly any noise inside the cab and it gave my truck an entirely new attitude. the system came with a resonator I will be adding another kit to the Sierra soon. The Kits come with everything you need to install, You most likely will have to replace the Cat bolts for they dont come off very nicely. -Jimmy

Where I live in Alberta Canada there aren't any emissions laws so trucks around here are complete custom exhaust setups that don't have converters just pipes and mufflers or pipes and glasspacks. I originally went with two 34" Thrush Magnum glasspacks on my truck but that was WAY too loud setting off car alarms and getting unwanted attention from the 5-0 so I went with two flow pro V-force II mufflers that give it an awesome throaty sound but really drones in the cab and almost gives a sensation of vibration through your bones. I dunno for yours I would probably just go with your typical Gibson after-cat system so you can have more performance without breaking the law.

GIBSON CATBACK....most definitly! The others are loud and resonate the cab...not good. The Gibson sounds so cool, a nice mellow burble at idle and a "classic V-8" rumble during acceleration and cruise. Best of all your cab is just about as quiet as the stock setup.....you'll hear just enough exhaust note to put a smile on your face.

I have a single, stock side exit system on my '98 shortbed w/305. The dual rear exit system costs a bit more and probably has a higher "cool factor" to the look but the side exit was cake to put in; I did it in about 1 1/2 hrs and I didn't have to mess with the spare location like you do with the dual system.

Mike

When an exhaust kit says that it will not fit hd, what are they talking about?

I am thinking about getting this exhaust kit for my 97.

http://proficientperformance.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=GIB-615506&Category_Code=gib_cb_swept-side_ss_gm_truck_96-00&Store_Code=PP

What is everyones opinions?


Also these headers.

http://proficientperformance.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=GIB-GP102S&Category_Code=gib_hdrs_ss_gm_truck_old&Store_Code=PP

How hard is it to install headers?

When an exhaust kit says that it will not fit hd, what are they talking about?

...my guess would be "heavy duty"...... both GM and Ford make "HD" versions of their P/U's that usually have a solid front axle with a leaf spring suspension.

Ohh. Thanks for the info.

all i can say is DYNOMAX, DYNOMAX, DYNOMAX

nuff said

i put cherrybombs on my 2001 sierra and there is not that much noise inside my truck the only thing i dont like about it is i dont have an idling sound but it has a nice sound when you get on it

i put flow master 40 series on my 2001 and i hated them so a buddy told me to try some cherry bombs and i like them hardly no noise in the cab and they sound nice when you get on it the only problem i have with they i dont have and idling sound

1999 GMC Sierra 1500 Ext. Cab (old body style) 305 (5.0 liter) single exhaust

I just had a Flowmaster 40 series Delta Flow put on my truck. It is a single in, single out, offset muffler, with 3" inside diameter on both the inlet and outlet. I also opted for a 3" aluminized tail-pipe and a 3" to 3.5" chrome tip. The original piping was 2 3/4" outside diameter. I am pretty happy with the final result. The in cab resonance is barely noticable at idle, definitely noticable when accelerating, and not bad when just cruising. The outside tone sounds really great, especially when I step on it. Idle has a nice outside tone as well. I also was trying to decide between the 50 series Delta Flow and the 40 series Delta Flow and I probably would be just as happy with the 50 series. I'll post in a couple of weeks to let you guys know if the in cab resonance is driving me nuts. Maybe I'll post some pics, as well...

I have a 1994, 2500, extended cab, 4X4 with a 5.7 engine. Installed a catback to flowmaster single in/dual out. Improved performance, cool sound, gas mileage would probably be better if I weren't hammering it so often. Slight increase in cab noise at highway speeds but not at all annoying as some in this post have complained. However, it probably would not appeal to a sensitive, artistic type person.