Hello, Does, anyone know if I can install a swept side Gibson exhaust system on a 95 F-150 with 4.9 Liter 300/6 engine?

This, exhaust system shows that it will work on a 4.9L 302 and 351 but does anyone know if it will work on a 300/6 straight 6 and how would it sound on this motor if it does?? Thanks, for any help on this! :-) Larry

 

A 300/6 is a 4.9L engine, so it should work.

 

Here I thought someone finally caught on to the fact that the 302 V8 really is a 4.9L. Ford probably called it a 5.0 for the better hotshot image in the Mustang and to avoid confusion with the 300 I6 which also is a 4.9L. Anyway, if you are not sure the exhaust system will fit, call Gibson and find out.

 

It will fit fine.
The 3" dia. Gibson on my 4.9L six-cylinder is the type that exits behind the passenger's side rear wheel (stock location) and was listed for the V-8 applications.
It is not loud at all, just has a nice Ford rumble to it, and is worth an MPG and a seat-of-the-pants torque increase.
It is one reasonably priced modification that is
really worthwhile.
Ed

 

Thanks, Eddie for the feedback! Where did you get your Gibson exhaust system and much did you pay for it? Also, what year is your truck?
Thanks, again Larry

 

My truck is a 1991 F-150 regular cab long bed with the inline-six.
I bought the system mail order from one of "4Wheeler & Offroad" or "Four Wheeler" Magazines' advertisers called "RV Performance Connection", with whom I am very pleased. Phone: 1-800-875-2112, web:www.performancecombos.com
I believe I ended up paying $234.00 for the system, which is well-built indeed.
The removal of the old and the installation of the new took a six-pack's time on a Sunday afternoon, the hardest part shortening the section of pipe that comes out of the converter; it's made long to accommodate Supercab length.
RV Performance sells package deals consisting of a K & N panel filter, Jacobs ignition, and Gibson exhaust. You might want to consider one of those.
Negotiate price with them a bit...they know very well that there are lots of cat-back exhaust manufacturers and mail-order houses.
Once the system was in and settled I had the joints welded.

Eddie

 

Eddie,

That sounds like a great system. I might consider it for my '95 f150 300 I6. I was going to go with Flowmaster 70 series muffler (the quieter one), but maybe Gibson is better. I have heard advice against a 3" exhaust on the 300 I6, but I think as long as the cat is in place, you probably can't get too low of a backpressure. You mention it is quiet. How does that compare to stock muffler?

 

Hey Paul, I was thinkin of Flowmaster also but, I have heard alot of good things on Gibson! I was told to go with a Flowmaster 3-chamber 50 series muffler but, thought it would be better to go with a total cat-back system.
That sounds like a good price that Eddie got for his. I know I looked at JC Whitney online to order the Swept Side but, for some reason it was not available? I may just look around town here for a dealer that sells Gibson or maybe I can order from them directly. C-ya! Larry

 

I have to have a pretty quiet muffler as the wife and kids sometimes ride with me and she already has enough to complain about when I jerk it a little and bounce the kids heads on the back window. Anyway the new exhaust has to wait for the original one to rot thru. Wives tend to not understand performance parts for the sake of performance, but such parts can be "justified" (read slipped in) when maintenance and repairs are necessary. I wonder if I can apply some salt or acid strategically to the existing muffler? Or better yet, since she would never crawl under the thing, maybe I could just punch a few holes in it (who knows, may improve the performance too).

 

How funny Paul!!! :-) That is so true!! hehe
Im still laughing! My wife was just saying "Typical Male" I was like OUCH! lol I know it's like one of those things you don't need {according to wives tails} but would like to have!
Larry

 

The exhaust sound on the Gibson is only slightly louder than the stocker; a deeper tone, and there is a slightly more intrusive drone at highway speeds.
The statement "...after-cat free-flow..." is oxymoronic, but these systems work; one of the bolt-ons that are really worthwhile.
My ex-boss liked the concept so much that he had a JBA cat-forward system put on his C**vy, and that one sounded really good, too.
If I had it to do over, I'd stay with the Gibson, but go with the dual-out under the rear bumper, and maybe spring for stainless steel, but after five years I don't see the necessity.

As far as "needing backpressure" goes, Tall Paul, somebody has pretty successfully blown smoke up your tailpipe.
The ideal is scavenge the exhaust in such a way as to create a vacuum if possible at the exhaust ports and combustion chambers, and maintain that to the atmosphere if possible.
My 300 has dual headers terminating in two
3-inch i.d. collectors, reduced via a fabricated "Y" to a single 3" i.d. inlet to a Random Technolgies 9000-series high flow cat, then out via the Gibson.
It passes smog, has incredible torque right off idle, and gets around 14-16mpg on the highway (4.10 gearing whacked mpg).
Fords in general, and 300-6s in particular, need all the help on the exhaust side they can get.

Eddie

 

Eddie: I read that backpressure stuff somewhere that without enough backpressure you lose some torque, but it really dosen't make sense. I would think you have 100% back pressure when you need it as the exhaust valve would be closed. It seems that any back pressure at other times is going to restrict cylinder filling of fuel/air mix. So, I guess I had better go with a Gibson cat back system. Do they provide a transition piece to mate the 3" with the existing, smaller pipe? Also, how much is a low restriction cat and does it make the system louder?

Thanks

 

don't know about the aftermarket cats (yet), but when i had my flowmaster 60 series muffler and 3" tailpipe installed, the shop just flared a piece of 2 1/2 (or whatever stock pipe is) up to 3" and welded it together that way. looks like it'll be more than adequate until I can get my paws on a 3" cat.
chuck

 

I just converted my 88 f-150 to a single cat system. I used a catco pipe kit (PK-4) that was the complete Y from the headers back and I bought a JC whitney 3" in 3" out cat. It is huge!! From there back I got a big *** muffler and 3" piping.

The truck is quiet and still pulls hard. I love it.

Randy

 

The stock Ford catalytic convertor exit piping is around 2-1/2 inches or less; I don't remember the exact diameter, nor do I remember if it was flanged or clamped, but I do remember being amazed at how easily the stock exhaust system separated from the cat.
Gibson provides four major pieces in their basic kit, which is what I have: 1., the "transition piece" which is flared from the cat's smaller outlet i.d. to Gibson's 3-inch size and which is long enough to accomodate a Supercab (and will require shortening if need be); 2., a h-u-g-e expansion-type welded-case muffler; 3., an over-the-axle piece; and 4., the tailpipe. Brackets for the stock hangers are welded on at the appropriate places.
No, make that 5 pieces: Also included is a 3-1/2 polished stainless bologna-cut tip.
It is just a really easy bolt-on that actually works...now, Mr. Gibson, can I be your highly paid do-nothing sales slob? Pleez?
Eddie