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Exhaust Exits on Suburban

2K views 6 replies 4 participants last post by  GMCBEAST 
#1 ·
This question is for the folks who have experience with the older model Suburbans and Blazers. As I'm sure you know when the exhaust exits the rear on these beasts and the tailgate window is down exhaust fumes fill the inside of the truck. If all windows are up, no fumes, all down except tailgate window, no fumes, it's only when that window is down. Every one I've owned (2 Suburbans, 1 K-5 Blazer, and 1 Fullsize Jimmy) have all had this problem along with several friends who've owned these trucks as well and it's ranged from stock rebuilds, high mileage and performance motors. Two of my four had exhaust pipes exiting at rear bumper, one had 90 degree turn outs behind rear tires and one with dumps before rearend, all with same problem. My question is has anyone done a 45 degree angle exit in front of the rear tires with these trucks and did it help with this problem? Gonna put a different exhaust system on my 'Burb to quiet it down some (after a run in with Kingsports finest) and would like to eliminate this problem in the process. I have a feeling Cats' are going to be mentioned and the problem exists with the cats' on as well, 3 of my trucks had them. Thanks for your help in advance.
 
#4 ·
I appreciate both of your responses. All of mine have done this with the front windows down along with the tailgate window. I wonder if because the '69 Burb is slightly more aerodynamic that plays a part in it. Either way I do appreciate your responses. Taking the old 'Burb to the exhaust shop next week and I'm going to try the 45's in front of rear wheels. Another suggestion that was given to me was to put a spoiler on the roof by rear of truck, it's funny 'cuz I always laughed when I'd see them with a spoiler but they might have known this to be a cure all along and were laughing at me as well for huffing fumes, lol. Thanks again guys.
 
#7 ·
After reading your post I did a search to see if someone might make/sell a rear air deflector for this model and sure enough good old Summit came through. It cost less than a tank of gas and doesn't look to obnoxious. Hopefully between this and my new exhaust I won't have to keep my tailgate window up. My five-fiftyfive a/c (5 windows down @ 55mph) will work much better with that window down. lol. Thanks a ton fella's I think if anything these two things will make it better.
 
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