Straight Pipe on a M10=flames/sparks when letting off?

[a3ternus]

Please explain.The E30 owner said it was a stock M10 with headers and thats it.Really loud though.So,straight pipe will do that?
Mine just pops and bangs a bit when letting off the gas but thats it...
N.

[seatown88]

Check for an exhaust leak or leaks

[Pussy30]

How short is that straight pipe?

[a3ternus]

I have no more info,just saw the flames (sparks to be exact-from the exhaust) and discussed a little with the owner...
N.