intake tube sizes Options

[dutchboy]

I have a couple spectre short ram intake tubes (3" diameter) that I am thinking about hooking together to make a cold air intake(I need a 90 deg elbow). I would then need to reduce to 2.5" at the intake manifold.
I got them pretty cheap, will be close to price of an bay intake for an ST once I get a filter.

Is this okay, or is it better to be same size all the way?

Thanks!

[cHinaman727]

All I know is that the larger the diameter, the greater the air flow. That is if I know my physics but then again haven't taken a class in forever.

[Kerr1]

it moves more air when u go from a large diameter to a smaller one...but there r boundaries...like say from 3 to 1" but u would get more power from wat u wantin to do than say 2.5 tha whole way.

[dutchboy]

What do you think of the cone filters that have a 360 deg. heat shield around the element?

I'm not sure if they are washable, and I don't know if this would kill the air flow?

Thanks

[Kerr1]

if it does restrict ne airflow i dont think it would b enough to tell.

[Jlacker3]

What exact Spectre parts/how many did you buy. I thought about doin that too.

[Jaws4God]

I actually went with a Mazda intake which is 2".. I realized that our intake manifold only has about a 2" inlet so why use 3" only to just have it go into a smaller manifold?

[b1gr3d]

larger dia = more FLOW but less velocity.....smaller dia = more VELOCITY but less flow...so it all depends. but generally 2-3in for our engines

[6strngs]

if it helps any, I tried to stick a 2.5" coupler on the throttle body and it was slightly too big, and I also stuck a 2.25" coupler on there and it was a really tight fit. so it's somewhere inbetween but either could work

[dutchboy]

What exact Spectre parts/how many did you buy. I thought about doin that too.

Go to your local autozone, I picked the spectre intake tubes up for $12 each on clearance(YMMV). I might go with an accord CAI though.

I think Checkers/Kragen/Schucks is having the mid-size spectre filters for $20 right now? About $35 total for a SRI. The angle on the spectre SRI tube is actually really nice, would put filter right in the old filter box spot(cut to size).