New exhaust in... - Toyota Yaris Forums

Spades · 07-19-2007, 01:54 AM

Well, switched mufflers and I am using a 2.5" inlet/outlet Borla Performance Turbo Muffler(stainless steel), 2.5" straight cut stainless tip, 2.5" cat-back mandrel bent stainles pipe fabbed up at a local shop, and removed the resonater. Still very quiet, very deep tone, very far from ricey, and it doesnt have the lawnmower sound or the 4" tip. I will get pictures as soon as the weather permits, raining like crazy here, shame I dont have anything to capture the sound with.

P.S. didn't really notice any horsepower increase...I figure a major power adder is needed for that. I am working on the exhaust though for if/when someone comes out with a roots type supercharger for these cars.

jdium · 07-19-2007, 06:31 AM

2.5 is a bit big I would think. Probably keeps the sound right where it needs to be, non-existent, but I'd bet you are actually losing power with that much flow...

mikeukrainetz · 07-19-2007, 02:22 PM

I agree, I use 2.25 / 2.5 on mild small block chev's and fords.
Ive heard some who have gone too large and get too much scavenging and windup melting out cats and headers.

Please update everyone if you have any problems.

Spades · 07-19-2007, 03:42 PM

havent heard about larger cat back exhaust melting cats before...generally larger pipe leads to less heat, but i am not a engineer. and yes, on a under 500 hp small block 2.5 per side on the dual exhaust is plenty. I didnt loose any noticable HP, however, didnt gain any noticable power either.

however, my exhaust is set up for when i get a header, high flow cat, header back exhaust and a supercharger...

I will keep you all updated on if i have any problems.

p.s. if you arent planning on any major power adders stock pipe would be more than adequate.

jdium · 07-19-2007, 04:54 PM

Quote:

Originally Posted by Spades

however, my exhaust is set up for when i get a header, high flow cat, header back exhaust and a supercharger...

It will still be too much IMO. What will the supercharger put you up to, 135hp? And you are at a flow level to support 250+ hp...

barebonedvitz · 07-19-2007, 09:27 PM

ditto wid jdium..
2.25 would be optimal if u would go s/c. 2.5's are better for turbos.

07-19-2007, 01:54 AM	#1
Spades The Hated One View User's Garage Drives: 07 White Manual Sedan Join Date: Sep 2006 Location: Oregon,USA Posts: 390	New exhaust in... Well, switched mufflers and I am using a 2.5" inlet/outlet Borla Performance Turbo Muffler(stainless steel), 2.5" straight cut stainless tip, 2.5" cat-back mandrel bent stainles pipe fabbed up at a local shop, and removed the resonater. Still very quiet, very deep tone, very far from ricey, and it doesnt have the lawnmower sound or the 4" tip. I will get pictures as soon as the weather permits, raining like crazy here, shame I dont have anything to capture the sound with. P.S. didn't really notice any horsepower increase...I figure a major power adder is needed for that. I am working on the exhaust though for if/when someone comes out with a roots type supercharger for these cars. __________________

07-19-2007, 06:31 AM	#2
jdium Mr Attitude Drives: Blazing Blue 5 Spd Join Date: Jun 2007 Location: Hillsboro Posts: 302	2.5 is a bit big I would think. Probably keeps the sound right where it needs to be, non-existent, but I'd bet you are actually losing power with that much flow... __________________ It's scary to think that half the people surrounding you are below average...

07-19-2007, 02:22 PM	#3
mikeukrainetz View User's Garage Drives: 2006 Toyota Yaris Join Date: May 2006 Location: Canada Posts: 564	I agree, I use 2.25 / 2.5 on mild small block chev's and fords. Ive heard some who have gone too large and get too much scavenging and windup melting out cats and headers. Please update everyone if you have any problems. __________________ http://www.cardomain.com/ride/2336679

07-19-2007, 03:42 PM	#4
Spades The Hated One View User's Garage Drives: 07 White Manual Sedan Join Date: Sep 2006 Location: Oregon,USA Posts: 390	havent heard about larger cat back exhaust melting cats before...generally larger pipe leads to less heat, but i am not a engineer. and yes, on a under 500 hp small block 2.5 per side on the dual exhaust is plenty. I didnt loose any noticable HP, however, didnt gain any noticable power either. however, my exhaust is set up for when i get a header, high flow cat, header back exhaust and a supercharger... I will keep you all updated on if i have any problems. p.s. if you arent planning on any major power adders stock pipe would be more than adequate. __________________

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07-19-2007, 09:27 PM	#6
barebonedvitz return of the comeback Drives: white '08LB..very nice,i like Join Date: Mar 2007 Location: sacramento,CA Posts: 155	ditto wid jdium.. 2.25 would be optimal if u would go s/c. 2.5's are better for turbos.