Slight hissing on acceleration when cold
 

I was wondering if this is possibly an exhaust leak? It only happens within the first couple minutes when I start the car. I'm guessing when the pipes warm up they expand slightly and seal the leak? It sounds similar to the hiss on deceleration and I only really hear it under moderately high to high throttle. It seems pretty harmless but just wanted to ask

Hi flow cats?

If you have high flow cats, that's your sound

/endthread

you're talking about acceleration right? I know it's normal in deceleration with hfc but that's not what I'm talking about

Not normal on accel. may wanna check for a leak

That's what I thought. Only thing is like I said I only hear it within the first couple minutes of driving so I wonder if it's a big deal

If it's a leaking gasket, the exhaust gases will erode the gasket (and possibly the flanges) and it will just get worse.

Do you have any aftermarket parts on your car? This would help in finding the source to your hiss.