Possible to Operate on Exhaust Tips?

[Mini-itx2010]

My car has a rather silly exhaust system. Its 3" straight thru all the way from downpipe to the muffler box. However, the exit tip are 2 tiny 1 1/2" tips in diameter. This causes a big restriction in flow. I calculate that I will need at least 2 x 2.1" tips in order to match the size of a single 3" tip.

 

Is it possible to bore up the hole in the muffler and weld on 2 exhaust tips of around 2 1/4" tips?

 

Thanks

[GLZT]

Why not change the entire exhaust tip?

[Mini-itx2010]

  On 10/23/2010 at 6:56 AM, GLZT said:

Why not change the entire exhaust tip?

 

You meant the muffler box or just the exhaust tipe?

 

I would want to keep the muffler box but I want the 2 exit holes (where the tip goes) to be at least 2 1/4". Then I can weld on new tips.

 

Is it possible to do that w/o having to replace the entire muffler box? Cause the muffler has the word TOYOTA FUTABA on it. This is keep unwanted attention away so I don't want to replace the entire box.

[Thedream]

I guess it's possible, although I suppose you know it's not just the tips you see sticking out of the muffler that you will need to replace. You will need to find "pipes" that go into the muffler.

 

 

My guess is that your calculations were based on the area of the openings of the pipes, but there may well have been reasons why your muffler was designed like this in the first place. One reason I can think of is backpressure. At low RPMs, it is easier for your engine to push "packed" exhausts. So while you may gain a little bit of max HP, you will likely also lose HP at low RPMs.

 

Also, I guess you know that this modification is not LTA-friendly

[Mini-itx2010]

  On 10/23/2010 at 7:26 AM, Thedream said:

I guess it's possible, although I suppose you know it's not just the tips you see sticking out of the muffler that you will need to replace. You will need to find "pipes" that go into the muffler.

 

 

 

My guess is that your calculations were based on the area of the openings of the pipes, but there may well have been reasons why your muffler was designed like this in the first place. One reason I can think of is backpressure. At low RPMs, it is easier for your engine to push "packed" exhausts. So while you may gain a little bit of max HP, you will likely also lose HP at low RPMs.

 

Also, I guess you know that this modification is not LTA-friendly

 

I have a question regarding the back pressure. I do udnerstand it works for NA car but how about TC ones? Would the turbine disrupt the backpressure already and thus destroying any benefits of it?

[Mini-itx2010]

OK, thanks for the help, I think I will ask Man exhaust to operate for me. I know its not LTA friendly. Actually, my exahust isn't LTA friendly either. I don't know how the previous owner managed to get a set of exhaust with the name on it. lol.......

[Thedream]

  On 10/23/2010 at 8:18 AM, Mini-itx2010 said:

I have a question regarding the back pressure. I do udnerstand it works for NA car but how about TC ones? Would the turbine disrupt the backpressure already and thus destroying any benefits of it?

 

Samo. For the WRX, we have seen loss of low-end power when changing to bigger exhausts. Actually the same was experienced even by just decatting.

 

[Tom_kkh]

  On 10/23/2010 at 8:18 AM, Mini-itx2010 said:

I have a question regarding the back pressure. I do udnerstand it works for NA car but how about TC ones? Would the turbine disrupt the backpressure already and thus destroying any benefits of it?

 

 

back pressure applies to all auto cars not particularly only to NA or turbo