Exhaust Pipe Challenge -- Test Your Knowledge!

[plik]

I have a 5.7 350 w/ TBI (1987-1995). It was a crate engine purchased about 10 years ago (it lives inside a 1984 suburban k20 4x4).

9.25:1 Compression ratio



With these exhaust headers (Hedman 69090) --



Okay, the questions .....

1. How large (diameter) should my exhaust pipes be? (2.5", 3", etc.)

2. Should I use an "H" pipe to connect the two banks, or just have each side of the engine be completely independent?

3. Where is the best place for an oxygen sensor?

4. Would Flowmaster Super 10 Series Mufflers be a good idea? If not, what would be better?

5. Should I have 1-in-1-out or 1-in-2-out mufflers?

6. What's the best catalytic converter for this vehicle?

FAQs:
- I want a good sounding, loud exhaust -- not loud stupid, but loud deep
- I care more about sound than off-the-line acceleration
- I never tow anything, but often do freeway driving
- I do want to pass emissions (Arizona)

[LTZ C20]

Before I answer all of your questions in one fail swoop, I need you to answer 2 questions for me.

1. How many O2 sensors does the truck truck need/use. You said TBI so based on my experience, that should be only one. Correct?

2. How many catalytic converters is the truck required to have? Some states require the same amount as it had factory, some require the same amount for the number of exhaust pipes used, see what I mean? So what's your requirements?

Answer those 2 for me and I should be able to answer all of yours easily. (Note: I'm very experienced with these TBI systems on small blocks.)

[plik]

Before I answer all of your questions in one fail swoop, I need you to answer 2 questions for me.

1. How many O2 sensors does the truck truck need/use. You said TBI so based on my experience, that should be only one. Correct?

2. How many catalytic converters is the truck required to have? Some states require the same amount as it had factory, some require the same amount for the number of exhaust pipes used, see what I mean? So what's your requirements?

Answer those 2 for me and I should be able to answer all of yours easily. (Note: I'm very experienced with these TBI systems on small blocks.)

1. Correct -- one O2 sensor
2. Two -- like you said, one for each exhaust pipe

[Irish_Alley]

before you ask us i would ask your inspection station what he wants to see and go from there

[plik]

before you ask us i would ask your inspection station what he wants to see and go from there

Definitely good advice. They're fine with my current setup, which is dual exhaust -- one on each side, completely independent, coming out the sides, in front of the back tires.

I should explain my current setup:

Right now I hate how my exhaust sounds. I think it's terrible. It looks cool, though.

It also goes from a 3" header (after the collector) to a 2.5" pipe. So, I'd like to switch that to be 3" all the way out, but I'm not sure if that's a good idea.

And for the muffler, I like what this guy has done --
 
[youtube]https://www.youtube.com/watch?v=X8I0DZpzp9U[/youtube]

[VileZambonie]

I would recommend 3" single exhaust with a flowmaster. The O2 bung should be in the collector.

[philo_beddoe]

Whats the highest quality quietest muffler one can purchase? I mean whisper quiet, like a sewing machine.

[Irish_Alley]

a prius

[1967KaiserM715]

Whats the highest quality quietest muffler one can purchase? I mean whisper quiet, like a sewing machine.

Stock, or something with a lot of baffles and fiberglass.

As to the OP, if you like the duals, 2.25 with an "x" or "H", your choice of muffler(magnaflow seems to be the better choice for a good deep "rumble"). Or run the single 3". Both will be good selections.


Sent from my iPhone using Tapatalk

[frotosride]

1. How large (diameter) should my exhaust pipes be? (2.5", 3", etc.) dual 2.5 will be louder but not deep, single 3" will be louder and deeper, dual 3" deep and quiet at idle( straight pipe opinion for experience on these sizes)

2. Should I use an "H" pipe to connect the two banks, or just have each side of the engine be completely independent?
A:This is a good idea even though you say you're not worried about acceleration.

3. Where is the best place for an oxygen sensor? 
A:Driver Side collector is where the factory TBI is located and that's based on #1 cylinder and firing order. 10* above center from a lateral perspective. this will prevent moisture form collecting on the sensor and ensure a long life. depending on your transmission shift linkage you may have to move it to the frame side and raise the angle closer to the top.

4. Would Flowmaster Super 10 Series Mufflers be a good idea?If not, what would be better? A:
LOUD!! Muffler basics= shorter mean louder! The only thing they offer louder than this muffler is the 'Outlaw' race muffler. bot of these will be loud. most importantly is in-cab noise. You will definitely have to commit to loving the sound of your exhaust or loud music if you choose either of these.

5. Should I have 1-in-1-out or 1-in-2-out mufflers? Duals= dual mufflers...all I got on this one

6. What's the best catalytic converter for this vehicle? Doesn't matter, all newer style CAT's flow great and restrict very little sound. Meet your inspection criteria and check the box.

[frotosride]

https://www.youtube.com/watch?v=QEBdiW4LbI0

[philo_beddoe]

a prius

Lol!!!

[philo_beddoe]

I saw the vid. All way to loud! Lol

[frotosride]

phil, I know you're not 100 years old.... too loud? ha!

[VileZambonie]

a prius

A+