Roush Mufflers or other Bolt On Mufflers for BOSS
Tasca Super Boss 429 Member
Joined: December 18, 2010
Posts: 3,708
Likes: 0
From: NorCal
A friend of mine was running the Corsa Extremes on his 5.0 last weekend at the track. I'm planning to go that route right now. They sound great and don't really come on until you hit about 3500 rpm which makes keeping a low pro around town easier when you want to. They advertise a 7hp/4tq gain and an 18lb weight savings....
Shelby GT350 Member
Joined: November 20, 2010
Posts: 2,382
Likes: 1
From: Sioux Falls, SD
Yep wondered the same thing. Interesting question though. I was at a big car show tonight talking to one of the guys from a local performance shop about them. He wondered about the restriction of the side pipes given their relatively small diameter and that there may be some hp to be freed up bypassing them. It made me wonder if in fact despite virtually everything else being done for performance reasons on the Boss, are the side pipes more "nostalgic"? They probably couldn't be built like the original Boss due to EPA/DOT restrictions today, including the extremely restrictive discs. Since the 302R cars are not running a quad exhaust, I am starting to wonder if a new X-pipe without the cutouts might not be in order at some point...... It would certainly cut some weight...maybe 20 lbs?.....and potentially flow better?
Tasca Super Boss 429 Member
Joined: December 18, 2010
Posts: 3,708
Likes: 0
From: NorCal
Yep wondered the same thing. Interesting question though. I was at a big car show tonight talking to one of the guys from a local performance shop about them. He wondered about the restriction of the side pipes given their relatively small diameter and that there may be some hp to be freed up bypassing them. It made me wonder if in fact despite virtually everything else being done for performance reasons on the Boss, are the side pipes more "nostalgic"? They probably couldn't be built like the original Boss due to EPA/DOT restrictions today, including the extremely restrictive discs. Since the 302R cars are not running a quad exhaust, I am starting to wonder if a new X-pipe without the cutouts might not be in order at some point...... It would certainly cut some weight...maybe 20 lbs?.....and potentially flow better?
Cobra R Member
Joined: January 4, 2011
Posts: 1,811
Likes: 0
Originally Posted by 5 DOT 0
I'm no expert on this but I think the reason why the Corsas increase HP is due to decreased back pressure. So if the side pipes increase HP by being opened up and decreasing back pressure isn't that the same thing as more free flowing mufflers? And wouldn't it be better to decrease back pressure prior to the exhaust hitting the mufflers? I'm just thinking out load here...
Opening the side pipes goes give an incremental increase in power. Im thinking of changing the mufflers but first I need to find the size and weight, I won't be buying an axle back as I think it's kinda pricey.
Tasca Super Boss 429 Member
Joined: December 18, 2010
Posts: 3,708
Likes: 0
From: NorCal
You might consider these from Ford Racing for an improvement in sound without breaking the bank.
http://www.latemodelrestoration.com/...ck-Exhaust-Kit
Tasca Super Boss 429 Member
Joined: December 18, 2010
Posts: 3,708
Likes: 0
From: NorCal
The Boss comes with the stock GT 5.0 mufflers with bigger tips added. The link I provided are similar (the same?) as the GT500 mufflers. There is a difference in sound.
Don't forget that the 302Rs also do not run cats.
Cobra Member
Joined: June 7, 2010
Posts: 1,089
Likes: 0
From: Earth
From 5.0 Mustangs & Super Fords August Issue 14 page article on Boss:
Talking about side-pipes with spacer plate removed:
Horsepower isn't affected in any case as there is no meaningful gas flow through the side-pipes, which are purposefully mounted 90 degrees to the main gas flow at the H pipe. Think of the side-pipes as the exhaust equivalent of the induction sound tube - Fun, but nothing you'll see on a stopwatch.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I strongly recommend getting this issue, one of the most informative article's with details provided from Tim Vaughn, RoadRunner's lead program engineer.
Talking about side-pipes with spacer plate removed:
Horsepower isn't affected in any case as there is no meaningful gas flow through the side-pipes, which are purposefully mounted 90 degrees to the main gas flow at the H pipe. Think of the side-pipes as the exhaust equivalent of the induction sound tube - Fun, but nothing you'll see on a stopwatch.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I strongly recommend getting this issue, one of the most informative article's with details provided from Tim Vaughn, RoadRunner's lead program engineer.
Shelby GT350 Member
Joined: November 20, 2010
Posts: 2,382
Likes: 1
From: Sioux Falls, SD
From 5.0 Mustangs & Super Fords August Issue 14 page article on Boss:
Talking about side-pipes with spacer plate removed:
Horsepower isn't affected in any case as there is no meaningful gas flow through the side-pipes, which are purposefully mounted 90 degrees to the main gas flow at the H pipe. Think of the side-pipes as the exhaust equivalent of the induction sound tube - Fun, but nothing you'll see on a stopwatch.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I strongly recommend getting this issue, one of the most informative article's with details provided from Tim Vaughn, RoadRunner's lead program engineer.
Talking about side-pipes with spacer plate removed:
Horsepower isn't affected in any case as there is no meaningful gas flow through the side-pipes, which are purposefully mounted 90 degrees to the main gas flow at the H pipe. Think of the side-pipes as the exhaust equivalent of the induction sound tube - Fun, but nothing you'll see on a stopwatch.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I strongly recommend getting this issue, one of the most informative article's with details provided from Tim Vaughn, RoadRunner's lead program engineer.
Tasca Super Boss 429 Member
Joined: December 18, 2010
Posts: 3,708
Likes: 0
From: NorCal
From 5.0 Mustangs & Super Fords August Issue 14 page article on Boss:
Talking about side-pipes with spacer plate removed:
Horsepower isn't affected in any case as there is no meaningful gas flow through the side-pipes, which are purposefully mounted 90 degrees to the main gas flow at the H pipe. Think of the side-pipes as the exhaust equivalent of the induction sound tube - Fun, but nothing you'll see on a stopwatch.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I strongly recommend getting this issue, one of the most informative article's with details provided from Tim Vaughn, RoadRunner's lead program engineer.
Talking about side-pipes with spacer plate removed:
Horsepower isn't affected in any case as there is no meaningful gas flow through the side-pipes, which are purposefully mounted 90 degrees to the main gas flow at the H pipe. Think of the side-pipes as the exhaust equivalent of the induction sound tube - Fun, but nothing you'll see on a stopwatch.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I strongly recommend getting this issue, one of the most informative article's with details provided from Tim Vaughn, RoadRunner's lead program engineer.
Last edited by 5 DOT 0; Jun 25, 2011 at 08:33 AM.
Bullitt Member
Joined: April 5, 2011
Posts: 419
Likes: 0
From: Italy
I'm all for more power but I like the fact that we have the side exhaust whereas the other models dont. It's one of the things that gets peoples attention when they are looking at the car and I mention it. Most of them squat down to check them out. I'll leave them in just because they are one of the pieces that makes the Boss different.
I wasnt thinking about changing mufflers but after hearing the sound clips I might just do it.
I wasnt thinking about changing mufflers but after hearing the sound clips I might just do it.
Shelby GT350 Member
Joined: November 20, 2010
Posts: 2,382
Likes: 1
From: Sioux Falls, SD
