3" Exhaust on Gen3 rx

Exhaust modifications

3" Exhaust on Gen3 rx

Postby Shrab Kebab » Sat Aug 22, 2020 12:13 pm

Hey guys, so a friend of mine is offering to sell me his old xforce exhaust from his forester for a good price and I was considering buying it, to my knowledge, the exhaust is a 3" catback and has been modified to a 2.5" inlet, I was thinking about taking it to an exhaust shop and getting it cut to suit my gen3 my00 RX liberty but have heard that 3" might be overkill for an NA and I would potentially lose backpressure so I just wanted to get some thoughts or advice on anyone who's a bit more educated on the topic.
Thanks in advance guys
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Re: 3" Exhaust on Gen3 rx

Postby RX25SE » Sat Aug 22, 2020 12:49 pm

3" is too large for a 2.5lit engine.
I would imagine by the time you pay for the 3" system, pay an exhaust shop to cut it apart to fit it to the RX you could have paid for a new custom exhaust that suits the car.
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Re: 3" Exhaust on Gen3 rx

Postby Shrab Kebab » Sat Aug 22, 2020 12:56 pm

hes offering me the 3" system for $150 and from places near me the general quote for a 2.25-2.5" catback system is around $500-$600,
Do you say 3" is too wide of a diameter for a 2.5L because of backpressure loss?
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Re: 3" Exhaust on Gen3 rx

Postby Yowie » Sat Aug 22, 2020 3:35 pm

"Engines need exhaust backpressure" is a horseshit myth from which we can move on.

If you want to mess around with a 3" exhaust picked up for a good price then go for it.
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